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Metal Gear Wiki

In military use, radio systems are used to pass on orders and communications between field, command, and support personnel, with radio transceivers used extensively in intelligence gathering operations. The technology has continued to develop for many decades, resulting in such communication systems as the Codec. When relaying messages, primarily to or from a command post, various soldiers while using a radio will end their sentences with "Over" and/or "out," in order to ensure that the message got through.


Cold War[]

HNI 0091

GRU radio system during the 1960s.

During the Cold War, the Soviets as well as the FOX unit utilized radios to communicate with their higher ups during missions. The radios utilized by FOX consisted of a turn-knob device on the right side of the soldier/operative's utility harness, used to allow them to receive the call when it rings or if they want to contact support for any reason, as well as a wired microphone that is situated near the ear, while the Soviet radio systems featured a telephone handle-like device with a red light situated on the left harness, as well as a radio antenna behind their right shoulderblade. However, at the time, the radio being used by each member of a squad was not a fully realized concept, and thus various squads in military factions, such as GRU during the 1960s, often needed a radioman in close proximity to be able to report to HQ during patrols. The radioman, aside from reporting any suspicious activity, could also order for enemy bombardments from nearby cannons. GRU officers who were inside buildings, such as in Graniny Gorki or Groznyj Grad, utilized radio-equipped alarm systems to notify command of an intruder, as they themselves were not equipped with radios. Although not an actual usage of a radio, faint radio chatter could be heard emitting from The Fury both just prior to and, most notably, right after the battle. In that case, the chatter was in his head, with it being heavily implied that this was due to PTSD pertaining to his accident during his time as a Cosmonaut.

By the 1970s, a radio system was developed to include a circuit that reverses the audio phase as a means to conceal any operatives involved. Overall, it resembled a standard transceiver. The KGB agent Vladimir Aleksandrovich Zadornov, while using the identity of Professor of Peace Ramón Gálvez Mena, had a radio in his office in Ciudad Colon, which he allowed Paz Ortega Andrade, one of his students, to use to maintain contact with Big Boss and the Militaires Sans Frontières during the time of the Peace Walker Incident, with MSF's subcommander Kazuhira Miller having modified the radio recovered by Snake to allow contact with her.[1]

FOXHOUND radio systems[]

During the 1990s, U.S. Special Forces Unit FOXHOUND used transceivers that allowed satellite communication from anywhere in the world. By utilizing burst-conversion signals via computers, decoding of transmissions by the enemy was prevented, even if an operative was captured. FOXHOUND members were nonetheless required to destroy the radio upon capture to keep America’s involvement a secret.


Otacon utilizes the Metal Gear Mk. II to communicate with Solid Snake, via the Codec system.

In the 2000s, FOXHOUND adopted the Codec system. Invented by Mei Ling, it incorporates anti-wiring coding, digital real-time burst communication. A normal communication over ten seconds is instantly codified, compressed, and transmitted in a burst one microsecond in length. It is received in real-time, unscrambled, and decoded. It is incomparably more innovative than the conventional anti-wiring frequency scrambler. The 24-hour system that is unaffected by weather is made possible by integrating information from high-altitude reconnaissance satellites and low-altitude reconnaissance planes. Despite this, substantial restrictions such as environmental harmonic resonance, enemy discovery, and very low structures over an operative have caused significant interference in past testing.

The Codec's receiver functioned by directly manipulating the small bones of the ear, such as the stapes, making it appear as if a user was talking to himself or herself. During the Big Shell Incident, the Codec utilized nanotechnology, allowing users to engage in nanomachine-based communication while outwardly appearing silent.[2] The nanomachine-based Codec model was nonetheless compatible with the older models, as well as standard military radios.[3]

The Codec system could process and send photos to people within its network from a digital camera. During the Tanker Incident, Solid Snake transmitted a photo of Sergei Gurlukovich for Otacon to ID, with the original plan being to upload further photos of the prototype Metal Gear RAY, before radio-tapping by the Patriots forced them to alter the plan. The system could also download websites, with Snake transmitting several to Raiden during the Big Shell Incident, which featured the same RAY photos.[4] By the time of Guns of the Patriots Incident in 2014, the Codec was implemented into Metal Gear Mk. II and III, allowing visual communication via its camera and video monitor.

Warning: The following information is from outside Hideo Kojima's core "Metal Gear Saga." Its canonicity within the continuity is disputed, therefore reader discretion is advised.[?]

The Codec remained in use by 2018, with it now giving visual displays of mission support to operatives via a holoprojection screen. Because of Raiden's reconstruction surgery after the doomed mission in Africa supplying him with an optical implant in his right eye, he could also effectively "see" his mission control talking with him if he otherwise couldn't use the holographic display. Similarly, the optical implant acted as a two-way channel, allowing for mission control to see from the operative's point of view.

The Codec also could be adjusted to broad direct-spread sequence spectrum within the blue-1 frequency hopping pattern, with its systems also kept the interference below process gain, and could communicate between Maverick HQ's data storage and the operative's tactical data line, with the overall increase in latency being below five percent, which is especially useful when undertaking missions not officially sanctioned by Maverick, as it ensured that enemy operatives were unaware that Maverick was even transmitting Codec frequencies, much less listening in.[5] The contacts also contained basic information on their identities, including their age (if applicable), their gender, their height, their country of origin, and their allegiance (if applicable). The Codec, similar to the 2009 incarnation, could also monitor frequencies from other radio models.[6] Besides Maverick, the cyborg members of Desperado also utilized the Codec.

Non-"Metal Gear Saga" information ends here.

Other usage[]


A radio handset, discarded by a Diamond Dogs field agent.

In 1984, the Intel Team of the PF Diamond Dogs utilized a handheld radio system. One Intel Team member had discarded the radio after sending a SOS signal to Mother Base while in the jungle near Kiziba Camp after escaping from that location, as a hint to his general vicinity in the event that the Diamond Dogs were trying to find his location. Venom Snake, when finding it, had scanned it for its last use via his iDroid.


Olga Gurlukovich, using a radio handset.

The Gurlukovich Mercenaries utilized two types of radio systems: one system, used primarily by grunts, was similar to the system utilized during the Cold War regarding a radio knob on the right shoulder of a harness. The other system was a standard radio system dating back from late World War II, early Cold War that resembled a huge cell phone, these were primarily utilized by the top leaders of the Gurlukovich Mercenaries; Olga and Sergei Gurlukovich. Liquid Ocelot utilized the latter radio system during his test in the Middle East. The Dead Cell members also wore radio implants within their ears to relay orders to each other by the Big Shell Incident.

Meryl phone

Meryl Silverburgh, using a SINCGARS handset.

Rat Patrol Team 01 utilized a SINCGARS radio system in the Middle East during the Guns of the Patriots Incident. Team leader Meryl Silverburgh used it to contact Solid Snake via the Codec when she discovered that, contrary to his earlier claims, he was actually intending to assassinate Liquid Ocelot, not simply carry out threat assessment.

Warning: The following information is from outside Hideo Kojima's core "Metal Gear Saga." Its canonicity within the continuity is disputed, therefore reader discretion is advised.[?]

During Desperado's occupation of Abkhazia, Mistral and Andrey Dolzaev utilized miniature radios to communicate with each other. Raiden also briefly utilized Mistral's radio shortly after she died when demanding for Dolzaev to surrender, nearing the end of his mission to quell the occupation.

Non-"Metal Gear Saga" information ends here.

Examples of radio hardware[]

Alarm systems[]

Wall-mounted alarm systems were colored red while resembling phone panels, and could activate an alarm if a button is pushed. The personnel at Graniny Gorki and Groznyj Grad utilized these systems if detecting an intruder during Operation Snake Eater in 1964, as the personnel lacked their own radios during patrols while indoors.

Vacuum radio transmitter[]

EVA radio

EVA's briefcase-enclosed radio transmitter.

A briefcase-sized transmitter that comes with a wired microphone, and utilizes various dials. During Operation Snake Eater in 1964, EVA used this to contact the Chinese government until it was destroyed by Colonel Volgin with his electricity. She later used a second one after she and Naked Snake arrived in Alaska, and spent the night in a lodge, although she later destroyed it by throwing it into a fire.

Fixed-set dial system[]

HNI 0046

A fixed radio in the 1960s.

A fixed radio system was utilized in 1964 within Bolshaya Past's supply depot in Tselinoyarsk.

Warning: The following information is from outside Hideo Kojima's core "Metal Gear Saga." Its canonicity within the continuity is disputed, therefore reader discretion is advised.[?]
A soldier controlled by player in MGS Portable Ops

Fixed radio system on San Hieronymo.

It was also utilized during the San Hieronymo Incident on the San Hieronymo Peninsula's communications base and in the radio tower at the ravine. It was through this system that Naked Snake made contact with Para-Medic and Sigint.

Non-"Metal Gear Saga" information ends here.


A type of listening device: It utilizes two pads connected to a bended strip to accommodate the cranium that acts as the audio receiver of radio transmissions. They sometimes come with a miniature microphone.

During the Virtuous Mission and Operation Snake Eater, Para-Medic and Major Zero utilized headsets. Likewise, The End was seen wearing headsets.

Warning: The following information is from outside Hideo Kojima's core "Metal Gear Saga." Its canonicity within the continuity is disputed, therefore reader discretion is advised.[?]

During the San Hieronymo Incident, various members of FOX utilized yellow and black headsets. Roy Campbell also wore headsets during the same incident. Para-Medic wore a set during the same incident, due to waiting for a response from Snake at Zero's orders.

Non-"Metal Gear Saga" information ends here.

Similarly, during the Peace Walker Incident, the Peace Sentinel soldiers utilized headsets. The MSF subcommander Kazuhira Miller also wore headsets while he was piloting the Huey. The Intel Team member Hideo also wore headsets. Prior to their gaining the radio with a circuit to reverse the audio phase in Puerto del Alba, the MSF utilized unidirectional signal headsets to relay messages, with any operatives in the field requiring that they make sure that no one is nearby to listen in before using them.

During the 1980s, Diamond Dogs chopper pilots wore various headsets. Ocelot was also seen wearing headsets while piloting one of Diamond Dogs' choppers.

Solid Snake 1995

Solid Snake, with radio headset.

During the 1990s, the FOXHOUND unit utilized lightweight flexible headsets with a high-performance microphone that can amplify sounds in the ear without the need of a loudspeaker by directly stimulating the small ear bones, although FOXHOUND members were required to destroy the headset upon capture to keep America's involvement a secret. In addition, the mission support group also utilized headsets.[7]

During the Big Shell Incident, Iroquois Pliskin utilized a headset normally used by SEAL commanding officers when infiltrating the Big Shell, which also clued in that he was not actually a SEAL operative (as SEAL commanding officers generally wear the headsets to relay commands to operatives in order to avoid requiring them to be on the battlefield directly per protocol).

During the Guns of the Patriots Incident, Pieuvre Armement and Praying Mantis utilized headsets, the former PMC utilizing Com-Tac Ballistic Headset brand and MBITR transceiver radios, and the latter utilizing the Peltor COMM-TAC II Headset brand. Otacon also utilized headsets when piloting a helicopter.

Warning: The following information is from outside Hideo Kojima's core "Metal Gear Saga." Its canonicity within the continuity is disputed, therefore reader discretion is advised.[?]

In 2018, Sunny wore some green headsets around her neck. Doktor also wore headets while piloting a helicopter in semi-auto mode.

Non-"Metal Gear Saga" information ends here.

Cochlear implant[]

During the 2000s, FOXHOUND operatives as well as Solid Snake utilized a cochlear implant to better disguise the Codec's receiver from the enemy.


Prior to infitrating Shadow Moses Island in 2005, Solid Snake was given a shot by Naomi Hunter during his mission briefing, which included a nanomachine base that would recharge the Codec's batteries.

During the late 2000s, a nanomachine-based Codec was utilized by various soldiers and operatives. In order to successfully prevent outside people from successfully listening in to the call, the operative speaks in a nanomachine-based language while externally appearing to be silent. After meeting with Raiden on board the Big Shell, Emma Emmerich realized that he was not working for the Sons of Liberty terrorists, due to his possession of Codec-enabling nanomachines.

Micro-radio transmitter[]

Warning: The following information is from outside Hideo Kojima's core "Metal Gear Saga." Its canonicity within the continuity is disputed, therefore reader discretion is advised.[?]
Character 13dolzaev

Andrey Dolzaev using a micro-radio transmitter to speak with Raiden (originally Mistral).

In 2018, these radio systems were utilized by the Desperado forces stationed at Abkhazia and by their client, the European extremist Andrey Dolzaev. After Mistral was killed, she used this radio to contact Dolzaev in her dying breaths. Raiden later used this same radio to demand for Dolzaev's surrender, although Dolzaev refused in a reply that Raiden deduced from his words meant he was going to commit suicide by blowing something up.

Non-"Metal Gear Saga" information ends here.

Consumer audio receivers[]

Consumer audio receivers are used to to reproduce audio signals transmitted by radio broadcasting stations, such as news events or music.

In 1964, the lodge that Naked Snake and EVA stayed at shortly after Operation Snake Eater, had a radio receiver that played music.

During 1984, the Soviet forces and various private forces, in Afghanistan and Africa, respectively, used boom boxes to listen to radio broadcast transmissions. A radio was also located in Venom Snake's hospital suite in Cyprus, which on one occasion played "The Man Who Sold the World" by Midge Ure, and on another, received a British news broadcast regarding a Soviet plane crash. While enroute Dhekelia SBA Memorial Hospital to Afghanistan after escaping from the former location when it was attacked, Venom Snake and Ocelot also heard on the radio that the Soviets were planning to boycott the 1984 Summer Olympics.

Warning: The following information is from outside Hideo Kojima's core "Metal Gear Saga." Its canonicity within the continuity is disputed, therefore reader discretion is advised.[?]

During the First Liberian Civil War, Solidus' main office at the Army of the Devil's main encampment contained a radio, which he used to play music for Raiden when lecturing him on the "nobility" of bladed weapons.

Non-"Metal Gear Saga" information ends here.

Behind the scenes[]

The wireless radio transceiver (現地調達 musenki?) has remained a staple of the Metal Gear series since its inception. It allows the player character to contact their mission support team who offer advice on how to proceed within the game, along with additional information on the game’s setting and environment. Optional conversations are also common in the series, and can be initiated by the player at certain points during the game’s progress.

Radio Mode[]

Mg codec screen

The Transceiver Mode in the original version of Metal Gear.

The radio can often be interacted with via an interface separate from the main game screen, variously referred to as the Transceiver Mode (Metal Gear, Metal Gear 2: Solid Snake), the Codec Mode (Metal Gear Solid, Metal Gear Solid 2: Sons of Liberty), the Codec Screen (MGS, MGS2, Metal Gear Solid 4: Guns of the Patriots), the Radio Mode (Metal Gear Solid 3: Snake Eater, MG,[8] MG2[8]) or the Radio Screen (MGS3, Metal Gear Solid: Portable Ops). The screen comprises a digital readout, displaying the frequency to which the radio is set, portraits of either the player character (MG), the supporting character (MGS4, Metal Gear Solid: Peace Walker,[9] Metal Gear Rising: Revengeance,[10]) or both (MG2MPO), and a window in the lower half of the screen, displaying the characters' dialogue in text. The portraits consist of either static or animated artwork, or in later games, fully 3D polygonal models.

During the game, support personnel will contact the player character, in which case the radio will beep and the word "CALL" will flash onscreen. These calls are either mandatory, with the transmission automatically accepted, or optional, allowing the player to ignore it. In order to contact another character, the player must input the relevant contact frequency and use the "SEND" function. In older games in the series, the player must make note of certain frequencies, which are only provided under specific circumstances, and are sometimes only given once. In later games, the Memory Window was introduced, consisting of a drop down menu that would display any frequencies that the player has made or received contact with. This was later retroactively incorporated into the re-released versions of the older games.

Development over the series[]

Early games[]

In Metal Gear (MG), the radio provides basic information on various items or boss characters, either by request or by call reception, and is completely dependent on the player's location. In the non-canon Snake's Revenge, the contact's appearance is displayed in the Transceiver Mode for the first time in the franchise. Metal Gear 2 (MG2) expanded on the radio's use, allowing greater detail to be relayed to the player regarding bosses, locations, and even the player's currently equipped weapon. 

Metal Gear Solid to Metal Gear Solid 2[]

MGS1 Codec 2.

The Codec screen in Metal Gear Solid.

The Codec system first appears in Metal Gear Solid (MGS), and returns in all chronological sequels. MGS also marked the introduction of full voice acting during radio conversations, which would appear in all later games except those released on portable consoles.

The term "codec" was first introduced to the series, and subsequently popularized, by the game's English translator Jeremy Blaustein.[11] A codec is a device or computer program for encoding or decoding a digital data stream or signal, being a portmanteau of coder-decoder.

Like its predecessor MG2, MGS features a unique sequence where the player must look on the back of the game’s packaging to discover a crucial radio frequency, which in this case was required to advance the game’s story. This minor twist would become infamous among players who had rented the game; since many video game rental outlets such as Blockbuster did not provide the original packaging along with the game, the only option for these players was to use an online guide to discover the frequency. Although its original purpose was to act as an anti-piracy measure for the designers, it was vital to show players early in the game that Metal Gear Solid was a very different gaming experience than what they were used to.

Metal Gear: Ghost Babel utilizes a similar radio system to MGS, but also includes a function to forward transmissions from other senders, as evidenced by Roy Campbell supplying Snake with General Eguabon's messages to the U.S. President. This function is carried over to Metal Gear Solid 2 (MGS2), in which the Colonel forwards select transmissions of SEAL Team 10 to Raiden.

Sons Of Liberty (Codec Screen)

The Codec screen in Metal Gear Solid 2.

To make the Codec screen more interactive, different features have often been added in different games. For example, in MGS2, pressing the R1 or R2 button will allow the player to hear the main character’s thoughts, while moving and pressing the analog sticks will pan the camera over and zoom in on the characters, respectively. In the Trial Edition demo, the analog sticks instead allowed limited camera rotation around the characters.

According to Hideo Kojima in The Making of Metal Gear Solid 2: Sons of Liberty, the Codec's purpose for educating new players contributed to the creation of the new character Raiden, as Solid Snake was a veteran and thus wouldn't need the Codec anymore [12] (even though he does use it again in Metal Gear Solid 4).

Metal Gear Solid 3 to Metal Gear Solid 4[]

In Metal Gear Solid 3 (MGS3), the radio allows the player to view personal information about Naked Snake’s contacts (more detailed information can be unlocked by frequently calling his support team). In addition, at some points during the call, pictures are displayed showing certain subject matter (e.g., various weapons/equipment, flora/fauna, machinery, and personnel) and videos (to demonstrate where someone is to go) will pop up to explain how to proceed and/or give the player a viewpoint. The radio can also be used to remove the Alert status when contacting special hidden frequencies, discovered by interrogating guards. In some cases, the character can also access radio frequencies used to unleash bombardments. In addition, the radio can also be utilized in Groznyj Grad to access areas by calling specific frequencies, provided that the player isn't already wearing Raikov's uniform. Like above, discovering these frequencies require interrogating guards.

In Portable Ops (MPO), the player can use the radio to recruit certain characters (i.e., Para-Medic and Sigint) by inviting them to travel to the San Hieronymo Peninsula during optional missions, and then retrieve them, or in the case of Ghost, recruit Sokolov. The player can access radio calls via non-portable radios located inside the Communication Base and, in the case of Ocelot, the Ravine, although these require special circumstances. Both Snake and other soldiers can contact Para-Medic, Roy Campbell, Sigint, and Ghost via radio for optional conversations. However, only Snake will actually be shown speaking and giving replies to either of those characters. Unlike the other "Solid" series games, the Codecs in Portable Ops don't have voiced dialogue. The Silo Complex area, and to a lesser extent the Silo Entrance area, also allows the radio to be used to unlock certain areas, though the player doesn't actually need to interrogate the guards due to the guards etching the frequency on windows near the locked doors.


The radio screen from the Portable Ops Plus website.

The official website for Metal Gear Solid: Portable Ops Plus allows the user to contact Naked Snake using the Radio. His frequency changes each time he is contacted. Aside from its usual role in contacting support staff in Portable Ops Plus, a radio is also used as the icon for the Fulton item, which was presumably to be used to call in a recovery.

While the Codec appears in the Metal Gear Acid games, it is not accessible, nor interactive, during gameplay, and is only used by the characters during cutscenes.

Codec (Guns of the Patriots)

The Codec screen in Metal Gear Solid 4.

The Codec was revamped for Metal Gear Solid 4 (MGS4), featuring a new screen layout and fully, realistically animated 3D models. In addition, the player can now not only fast forward conversations (a feature added in MGS2) but can skip them entirely. The player can also resume the conversation at any time during a fast forward. However, it should be noted that the 3D layout for communicating with the characters is only reserved for Otacon, Roy Campbell, and Rosemary. Other contacts such as Drebin, Rat Patrol Team 01, and Raiden’s screens will not display the characters at all, and in fact will either display static (Raiden) or the logo for the respective group (Rat Patrol and Drebin). MGS4 does not allow the player to save their progress via Codec contacts, as saving is instead relegated to the pause menu. The ability to see contacts is also justified in-universe by the presence of a video screen on the Metal Gear Mk. II/Mk. III.

Hideo Kojima had desired to implement a way to only let the player see their contacts when using the radio since MGS2, although he wasn't able to implement it until MGS3, which even then, it still took until MGS4 for the main character to be audio-only in the Codec/radio calls (as MGS3 had Naked Snake still being somewhat present in the radio conversations, only somewhat out of view and part of the background).

The game Metal Gear Online also had the Codec operate in a similar manner. In addition headsets that are unlockable via the Reward Zone (which are based on the headsets used by Pieuvre Armement and Praying Mantis) allow the player to access the Codec.

Metal Gear Rising: Revengeance[]

The Codec makes a reappearance in the game Metal Gear Rising: Revengeance (MGR), possessing more Codec conversations in the game than in MGS4. Cutscene or otherwise plot-important Codec calls appear in front of Raiden while he walks automatically in the form of the holoscreen, while optional Codec calls will appear in a similar manner to previous games by being selectable from the main menu and then calling the person. Similar to in MGS4, the ability to see contacts when calling them is justified in-universe, in this case by the usage of Augmented Reality.

MGR is the first game since MGS3 to have a radio contact assigned to save the player's progress (in this case, Courtney Collins), and to have basic bio data for each contact when spoken with.

Unlike previous games, MGR does not actually have frequencies for the contacts, with the player instead simply selecting the them by name (a feature earlier used in the non-canon Snake's Revenge). The player cannot access the Codec during the prologue, which is only available from Chapter R-01, with Codec calls being supplied automatically in real-time, and even then, only from Boris Popov. The Codec Screen is inaccessible in Jetstream and Blade Wolf DLC, although LQ-84i, Monsoon, and Steven Armstrong do call Sam during scripted events in the former, and Mistral and Khamsin do call the LQ-84i in scripted events of the latter (the latter character in a FMV cutscene only).

After defeating various bosses (specifically, LQ-84i, Mistral, Monsoon, and Sundowner), they will contact Raiden posthumously via the Codec immediately afterwards for one final transmission.

Accessing most of the Codec calls in MGR will unlock the achievement "Amateur Radio Operator."

In the PC version for MGR, the calls can be replayed on a special menu called "Codecs" on the main menu once they are unlocked in-game.

Peace Walker and Metal Gear Solid V[]

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The radio screen in Metal Gear Solid: Peace Walker (post-mission only).

In Peace Walker (PW), the radio system (referred to in-game by Naked Snake as a radio with a circuit to reverse the audio phase) was completely revamped: For instance, during the prologue, the radio can only be accessed during certain points of the mission, and thus cannot be freely used until the beginning of Chapter 1. Even then, the radio, identified as the "Codec" in the menu, will alter frequencies between each chapter (or in the case of Chapter 1 and Chapter 5, between two events), and the player will also select the radio by menu or access it by pressing the select button if it is currently assigned to the radio. In addition, because of these new features, the player cannot actually select who to contact, as the calls will be random, and in addition, the calls themselves are very short. The staple of detailed conversations in the series are instead reserved for the Briefing Files as well as the briefing/debriefing Codec calls reserved for the end of a mission.

The radio can also be used to transmit certain commands to CO-OP partners under the CO-OP menu, and in the case of the "Date with Paz" mission and certain bonus radio transmissions, bolster/lower her emotional level and intimidate various enemy soldiers, respectively.

In the same game, after completing some missions, there are also post-mission codec calls where Naked Snake communicates with one of the main characters. Some are replayable, such as the post-mission codec calls at the end of most of the Main Ops missions. Others, however, are one time only. Examples of the latter include calls where Kazuhira Miller informs Snake of a new function on Mother Base, his notifications on Mother Base’s renovations to a Hexagon-based design, briefings unlocked after placing Huey and Strangelove into the R&D Team, ZEKE’s completion, as well as Miller informing Snake about recent events in Chapter 5 (such as EVA delivering a cassette tape, Paz and Strangelove requesting to join MSF, and notifying Snake of Zadornov’s escapes).


The Codec as shown in The Phantom Pain.

In Metal Gear Solid V: Ground Zeroes, the player, by pressing the shoulder button, can only contact Kazuhira Miller for some background details on whatever is sighted in first person view. In addition, like Peace Walker before it, detailed conversations in Ground Zeroes will be accessed via cassette tapes that are collectible throughout the game instead of via radio contacts. The Phantom Pain is also implied to have this as well, with Kojima saying this method was more impactful due to the player piecing together the story.[13] Dummied content discovered in the PC version of Ground Zeroes had interrogation commands that implied that the player had the option to force an interrogated enemy to answer their radio. Concept art for the Parasite Unit in The Phantom Pain depicted a Camo soldier with a headset, implying that the Skulls were originally going to speak. If the player managed to access two radio conversations simultaneously (eg, getting a call from Miller about retrieving soldiers and completing an FOB), the caller will make a grunt before making the latter call. Dummied content for The Phantom Pain also indicated that it would have had Codec screens similar to that in Peace Walker.

There was originally going to be news reports on the radio in Venom Snake's ward in the beginning of the game. In particular, besides coverage of the crash caused by the Third Child, it would have mentioned a provisional government building being opened on December 7, Cherneko being nominated Secretary General of the Soviet Union to replace Andropov, reports about the New York stock trade, comments about SDI and Ronald Reagan's involvement in it, and the Soviet Boycott of the 1984 olympics.[14]

Metal Gear Survive[]

During standard gameplay, the radio functions in a similar manner to Metal Gear Solid V and Peace Walker. However, the player cannot actually call their contacts, as they are made automatically.

Aside from this, portable radios can be collected to salvage spare parts for development.

Other uses[]

The Metal Gear Solid 3-Metal Gear Solid V radio ring-tone is used to represent Metal Gear Solid: Snake Eater 3D on the 3DS menu screen when selected, either when the game cartridge is installed or if the game is downloaded.

During the leadup to the release of Metal Gear Solid Master Collection Vol.1, or more specifically, the release of Sneaking during that time, a teaser video was shown of the MGS1 codec screen with the frequency 444.44, which then has a call come in from Mori Calliope, the singer of the song, where she says "Kept you waiting ha? I'm at sneaking point." The codec frequency being entirely composed of the number 4 is a subtle pun on how the Japanese word for four, "shi", is considered a number of bad omen due to her persona being a grim reaper apprentice.[15]

In-universe references[]

The radio screen interface in the games exists primarily to provide interesting visuals to accompany extended dialogue sequences. In most games, no characters possess any visual display monitors, although there are several occasions in the series when visual communication is implied. However, these are often used as a means of conveying gameplay information to the player, as well as characters’ personalities, and are generally considered to be an act of fourth wall breaking (with the exception of MGS4 and MGR, as noted above).

In Metal Gear Solid, Liquid asks Snake whether he "liked his sunglasses," in reference to his impersonation of Master Miller. Prior to revealing his true identity via the Codec, he physically removes the eyeware in his animated portrait displayed in the game.

Other examples in the series include:

  • Various radio personnel reacting as though they are aware of the protagonist’s situation, without any prior dialogue with him, such as his immediate surroundings, along with items and weapons he has procured;
  • Snake's remark that Mei Ling is "cute" when first introduced to her via Codec;
  • Mei Ling winking when providing her radio frequency;
  • Mei Ling sticking out her tongue if the player calls her repeatedly without saving the game;
  • Meryl removing her balaclava whenever she talks to Snake via Codec.

There are also occasions when characters can hear Snake's received calls, despite his use of a cochlear implant, either to highlight gameplay hints, or for comedic purposes. These include Otacon hearing Psycho Mantis’ mind control music while Snake is talking to Meryl, and Meryl hearing Snake’s Codec beep that interrupts a romantic moment between the two.

On the Japanese Metal Gear Solid: Integral website, the English language picture biographies for Naomi Hunter and Nastasha Romanenko claim that they provide support to Snake via "vidcom," while the accompanying Japanese texts make no mention of this. Nastasha's biographical account In the Darkness of Shadow Moses makes clear that her communication with Snake is exclusively via audio transmission, only hearing his voice and the game’s events due to radio equipment in her house.[16] The Integral picture biographies were later featured on The Twin Snakes website, although the accompanying English texts either replace the term "vidcom" with "Codec" (Nastasha) or make no mention of the device at all (Naomi).

In MGS3, Para-Medic mentions that, "50 years from [the Virtuous Mission]," radios would be developed that allow the user to see who is being contacted, in an optional radio conversation. MGS4 is the first game to show the player character using the Codec with a video monitor, via the Metal Gear Mk. II, and later, the Mk. III. Only users speaking through a camera, i.e. Otacon, Campbell, and Rose, are shown in the Codec screen, whereas all other users are represented by some associated symbol; prior to obtaining the Mk. II in the game, the latter is also true for Otacon.

In the Raymond Benson novelization for Metal Gear Solid, Snake's Codec features a camera that can be used to submit photos to his support team, and a wrist-mounted screen for video communication. Liquid’s line of dialogue from the game, regarding his sunglasses, is thus maintained in the novel.

Super Smash Bros. Brawl[]

The Codec also appears in Super Smash Bros. Brawl, but can only be accessed by Snake while fighting on Shadow Moses. To initiate the Codec, the player must press the taunt button for a split-second. Roy Campbell, Mei Ling, Otacon, and Slippy Toad from the Star Fox series can talk to the player about one of Snake’s opponents. In addition, although all of Snake's contacts (barring Slippy, who obviously isn't a Metal Gear character) retained their Codec portraits from Metal Gear Solid, Snake's Codec portrait was modified slightly to make him more in-line with his Metal Gear Solid 2/Super Smash Bros. Brawl appearance. Aside from these uses, two of his victory poses has Snake calling in the Codec, either calling Roy Campbell to tell him his mission had been accomplished, or otherwise identifying himself and saying he's done.

Although the Codec itself, alongside the Metal Gear franchise, does not return in Super Smash Bros. 4, its functions are retained with Pit's ability Palutena's Guidance, which also requires similar methods to accessing (including using it on a specific stage [Palutena's temple in this case] and using a Smash Taunt), and also featuring the cast of the game the stage was based on, plus a character from an unrelated franchise (Palutena herself, Viridi, and Dark Pit from Kid Icarus Uprising, and Chrom from Fire Emblem: Awakening). Palutena's Guidance itself referenced a gameplay element from Kid Icarus: Uprising, which was similar in overall nature to the Codec conversations in Metal Gear Solid. At Fan Expo Boston in September 2018 relating to Super Smash Bros. Ultimate, Snake's voice actor David Hayter let slip that no Codec conversations had been recorded for the game yet, before admitting he was probably not supposed to say anything.[17] Upon release, it is revealed that there are no Codec conversations for any of the characters debuting after Brawl, although the Codec Conversations from Brawl do indeed return.

Contact frequencies[]

These are the frequencies the player can use to contact radio support personnel in the Metal Gear series.

Metal Gear[]

  • Big Boss - 120.85 (later 120.13)
  • Schneider - 120.79 (later 120.26)
  • Diane - 120.33 (later 120.91)
  • Jennifer - 120.48
  • FOXHOUND HQ - 120.13 (ending)[18]
  • KNK Radio - 120.77 (ending)
Codec mg2

The transceiver screen in the original version of Metal Gear 2.

Codec mg2 update

The updated transceiver screen in the re-released versions of Metal Gear 2.

Metal Gear 2: Solid Snake[]

Metal Gear Solid[]

The Staff Message frequency has different effects varying in language. In Japanese, it displays a message. In English, it plays a remix of three different songs: "Discovery," "Zanzibar Breeze," and "Theme of Solid Snake." Keep in mind that both versions are only in the Integral version of the game.


The Codec screen in Metal Gear: Ghost Babel.

Metal Gear: Ghost Babel[]

Metal Gear Solid 2: Sons of Liberty[]


  • Otacon - 141.12
  • Otacon (save) - 140.96


Metal Gear Solid 3: Snake Eater[]

Snake Eater (Codec Screen)

The Radio screen in Metal Gear Solid 3.

Healin’ Tracks

  • 140.01 - "Salty Catfish" / 66 Boys (Very Easy/Easy)
  • 145.83 - "Salty Catfish" / 66 Boys (Normal)
  • 146.07 - "Salty Catfish" / 66 Boys (Hard)
  • 141.42 - "Salty Catfish" / 66 Boys (Extreme)
  • 140.52 - "Rock Me Baby" / 66 Boys (Very Easy/Easy)
  • 146.65 - "Rock Me Baby" / 66 Boys (Normal)
  • 143.83 - "Rock Me Baby" / 66 Boys (Hard)
  • 148.66 - "Rock Me Baby" / 66 Boys (Extreme)
  • 141.24 - "Sea Breeze" / Sergei Mantis (Very Easy/Easy)
  • 142.09 - "Sea Breeze" / Sergei Mantis (Normal)
  • 145.72 - "Sea Breeze" / Sergei Mantis (Hard)
  • 145.18 - "Sea Breeze" / Sergei Mantis (Extreme)
  • 142.94 - "Pillow Talk" / Starry.K (Very Easy/Easy)
  • 148.96 - "Pillow Talk" / Starry.K (Normal)
  • 144.25 - "Pillow Talk" / Starry.K (Hard)
  • 140.16 - "Pillow Talk" / Starry.K (Extreme)
  • 144.06 - "Jumpin’ Johnny" / Chunk Raspberry (Very Easy/Easy)
  • 144.86 - "Jumpin’ Johnny" / Chunk Raspberry (Normal)
  • 147.96 - "Jumpin’ Johnny" / Chunk Raspberry (Hard)
  • 148.78 - "Jumpin’ Johnny" / Chunk Raspberry (Extreme)
  • 147.08 - "Surfing Guitar" / 66 Boys (Very Easy/Easy)
  • 148.39 - "Surfing Guitar" / 66 Boys (Normal)
  • 141.59 - "Surfing Guitar" / 66 Boys (Hard)
  • 146.45 - "Surfing Guitar" / 66 Boys (Extreme)
  • 147.59 - "Sailor" / Starry.K (Very Easy/Easy)
  • 143.32 - "Sailor" / Starry.K (Normal)
  • 143.97 - "Sailor" / Starry.K (Hard)
  • 142.42 - "Sailor" / Starry.K (Extreme)
  • 149.53 - "Don’t Be Afraid" / Rika Muranaka (Very Easy/Easy)
  • 141.85 - "Don’t Be Afraid" / Rika Muranaka (Normal)
  • 144.63 - "Don’t Be Afraid" / Rika Muranaka (Hard)
  • 149.39 - "Don’t Be Afraid" / Rika Muranaka (Extreme)

Note: Calling any one of the Healin' Tracks and all of the Healin' Tracks in the HD version will unlock the achievements/trophies Serenity Now (a subtle pun of the film Apocalypse Now) and Tune-In Tokyo, respectively.

Cancel Alert


Guards can be interrogated to learn certain radio frequencies.

  • 146.20 - Dolinovodno (Hard)
  • 142.65 - Dolinovodno (Extreme)
  • 143.03 - Bolshaya Past South (Very Easy/Easy)
  • 147.11 - Bolshaya Past South (Normal)
  • 146.91 - Bolshaya Past South (Hard)
  • 144.52 - Bolshaya Past South (Extreme)
  • 149.46 - Bolshaya Past Base (Normal)
  • 140.61 - Ponizovje West (Normal)
  • 145.42 - Ponizovje West (Hard)
  • 149.75 - Ponizovje Warehouse: Exterior (Very Easy/Easy)
  • 149.63 - Ponizovje Warehouse (Very Easy/Easy)
  • 141.45 - Ponizovje Warehouse (Normal)
  • 142.48 - Ponizovje Warehouse (Hard)
  • 143.72 - Ponizovje Warehouse (Extreme)
  • 149.90 - Graniny Gorki Lab 1F/2F (Very Easy/Easy)
  • 145.07 - Graniny Gorki Lab 1F/2F (Extreme)
  • 144.87 - Graniny Gorki Lab B1 East (Hard)
  • 145.31 - Graniny Gorki Lab B1 East (Extreme)
  • 148.87 - Svyatogornyj West (Very Easy/Easy)
  • 142.79 - Svyatogornyj West (Normal)
  • 145.59 - Svyatogornyj West (Hard)
  • 144.28 - Svyatogornyj West (Extreme)
  • 146.59 - Svyatogornyj East (Very Easy/Easy)
  • 148.04 - Svyatogornyj East (Normal)
  • 142.03 - Svyatogornyj East (Hard)
  • 147.79 - Svyatogornyj East (Extreme)
  • 140.94 - Krasnogorje Mountain Base (Hard)
  • 148.54 - Krasnogorje Mountain Base (Extreme)
  • 145.94 - Krasnogorje Mountainside (Very Easy/Easy)
  • 146.67 - Krasnogorje Mountainside (Normal)
  • 140.15 - Krasnogorje Mountaintop (before EVA; Very Easy/Easy)
  • 141.98 - Krasnogorje Mountaintop (before EVA; Normal)
  • 140.58 - Krasnogorje Mountaintop (after EVA; Hard)
  • 148.26 - Krasnogorje Mountaintop (after EVA; Extreme)
  • 143.16 - Groznyj Grad 1F Southwest Section (Very Easy/Easy)
  • 147.54 - Groznyj Grad 1F Southwest Section (Hard)
  • 147.49 - Groznyj Grad 1F Northwest Section (Very Easy/Easy)
  • 140.47 - Groznyj Grad 1F Northwest Section (Extreme)
  • 141.53 - Groznyj Grad 1F Northeast Section (Normal)
  • 141.17 - Groznyj Grad 1F Northeast Section (Extreme)
  • 144.40 - Groznyj Grad 1F Southeast Section (Normal)
  • 146.08 - Groznyj Grad 1F Southeast Section (Hard)
  • 143.94 - Groznyj Grad Weapons Lab East Wing (Very Easy/Easy)
  • 144.61 - Groznyj Grad Weapons Lab East Wing (Normal)
  • 147.65 - Groznyj Grad Weapons Lab East Wing (Hard)
  • 144.14 - Groznyj Grad Weapons Lab East Wing (Extreme)

Fire Support Request

  • 140.73 - Bolshaya Past South (Very Easy/Easy)
  • 141.62 - Bolshaya Past South (Normal)
  • 147.23 - Bolshaya Past South (Hard)
  • 146.14 - Bolshaya Past South (Extreme)
  • 148.63 - Bolshaya Past Base (Hard)
  • 148.17 - Bolshaya Past Base (Extreme)
  • 145.28 - Ponizovje West (Very Easy/Easy)
  • 142.12 - Ponizovje West (Normal)
  • 140.36 - Ponizovje West (Hard)
  • 143.20 - Ponizovje West (Extreme)
  • 143.89 - Ponizovje Warehouse: Exterior (Very Easy/Easy)
  • 147.32 - Ponizovje Warehouse: Exterior (Normal)
  • 144.19 - Ponizovje Warehouse: Exterior (Hard)
  • 148.98 - Ponizovje Warehouse: Exterior (Extreme)
  • 144.03 - Ponizovje Warehouse (Very Easy/Easy)
  • 148.56 - Ponizovje Warehouse (Normal)
  • 142.91 - Ponizovje Warehouse (Hard)
  • 140.22 - Ponizovje Warehouse (Extreme)
  • 143.61 - Graniny Gorki Lab Exterior Yard (Very Easy/Easy)
  • 146.74 - Graniny Gorki Lab Exterior Yard (Normal)
  • 149.84 - Graniny Gorki Lab Exterior Yard (Hard)
  • 147.82 - Graniny Gorki Lab Exterior Yard (Extreme)
  • 144.93 - Svyatogornyj West (Very Easy/Easy)
  • 141.31 - Svyatogornyj West (Normal)
  • 141.79 - Svyatogornyj West (Hard)
  • 147.04 - Svyatogornyj East (Very Easy/Easy)
  • 149.29 - Svyatogornyj East (Normal)
  • 142.86 - Svyatogornyj East (Hard)
  • 145.80 - Svyatogornyj East (Extreme)
  • 143.98 - Krasnogorje Mountain Base (Very Easy/Easy)
  • 145.68 - Krasnogorje Mountain Base (Normal)
  • 149.52 - Krasnogorje Mountain Base (Hard)
  • 141.03 - Krasnogorje Mountain Base (Extreme)
  • 144.39 - Krasnogorje Mountainside (Very Easy/Easy)
  • 147.90 - Krasnogorje Mountainside (Normal)
  • 149.12 - Krasnogorje Mountainside (Hard)
  • 146.46 - Krasnogorje Mountainside (Extreme)
  • 143.56 - Krasnogorje Mountaintop (before EVA; Very Easy/Easy)
  • 140.09 - Krasnogorje Mountaintop (before EVA; Normal)
  • 142.29 - Krasnogorje Mountaintop (after EVA; Hard)
  • 145.99 - Krasnogorje Mountaintop (after EVA; Extreme)
  • 149.06 - Zaozyorje East (Very Easy/Easy)
  • 146.33 - Zaozyorje East (Normal)
  • 148.31 - Zaozyorje East (Hard)
  • 146.82 - Zaozyorje East (Extreme)

Frequency locks

  • 148.13 - Groznyj Grad Weapons Lab East Wing 1F Eastern Door (Very Easy/Easy /Normal)
  • 144.41 - Groznyj Grad Weapons Lab East Wing 1F Eastern Door (Hard)
  • 141.06 - Groznyj Grad Weapons Lab East Wing 1F Eastern Door (Extreme)
  • 147.86 - Groznyj Grad Weapons Lab East Wing 2F Northern Door (Very Easy/Easy/Normal/Hard)
  • 149.48 - Groznyj Grad Weapons Lab East Wing 2F Northern Door (Extreme)
  • 145.86 - Groznyj Grad Weapons Lab East Wing 1F Western Door (Very Easy/Easy/Normal)
  • 146.95 - Groznyj Grad Weapons Lab East Wing 1F Western Door (Hard)
  • 142.81 - Groznyj Grad Weapons Lab East Wing 1F Western Door (Extreme)
  • 143.45 - Groznyj Grad Weapons Lab East Wing 2F Southern Door (Very Easy/Easy/Normal)
  • 140.30 - Groznyj Grad Weapons Lab East Wing 2F Southern Door (Hard)
  • 142.57 - Groznyj Grad Weapons Lab East Wing 2F Southern Door (Extreme)

Metal Gear Acid[]

Metal Gear Solid: Portable Ops[]


The Radio screen in Metal Gear Solid: Portable Ops.

  • 140.85 - Roy Campbell/various soldiers recruited by Snake[26]
  • 143.15 - Prisoner Evacuation
  • 145.73 - Para-Medic
  • 148.41 - Sigint
  • 144.73 - Ghost
  • 145.75 - Frequency lock key
  • 147.42 - Frequency lock key
  • 148.51 - Frequency lock key
  • 145.62 - Frequency lock key (Saturn V documents)
  • 140.02 - HQ (Town)
  • 146.78 - HQ (Town, multiple revisits)
  • 141.23 - Ocelot[27]
  • 145.25 - EVA[28]

A Codec call in Super Smash Bros. Brawl.

Super Smash Bros. Brawl[]

A full list of the Codec conversations from Super Smash Bros. Brawl can be found here.

Metal Gear Solid Mobile[]

Metal Gear Solid 4: Guns of the Patriots[]

While the player can call Otacon and Rosemary almost anytime they please, the rest of the contacts will only call them at certain points of the storyline. On that note, the contacts that only call at certain parts of the story (barring Campbell) also never show their face.

Metal Gear Solid: Peace Walker[]

The radio is referred to as the Codec in the menu screen and the frequencies change during each chapter.

A Country Without an Army

Eastern Limon:

  • Miller: 145.38
  • Paz: 140.11

Mt. Irazu Area:

  • Miller: 144.17
  • Paz: 143.16
  • Amanda: 145.66
  • Chico: 140.96

The Phantom Hero

  • Miller: 142.03
  • Paz: 144.09
  • Amanda: 145.72
  • Chico: 143.42
  • Huey: 146.74
  • Cécile: 140.89

A Nation Reborn

  • Miller: 147.75
  • Amanda: 141.46
  • Chico: 140.08
  • Huey: 144.21
  • Cécile: 145.74

The Illusion of Peace

  • Miller: 144.16
  • Paz: 144.16[30]
  • Amanda: 140.90[31]
  • Chico: 143.47[32]
  • Huey: 146.88
  • Cécile: 147.65

Outer Heaven

Zadornov missions:

  • Miller: 145.38
  • Paz: 140.11
  • Amanda: 144.42
  • Chico: 143.63
  • Cécile: 146.95
  • Strangelove: 142.52

ZEKE Battle:

  • Miller: 149.57
  • Amanda: 144.44
  • Chico: 140.57
  • Huey: 143.11
  • Cécile: 146.52
  • Strangelove: 145.82


  • The End: 000.00

Metal Gear Rising: Revengeance[]

Main story:

Jetstream DLC:

  • LQ-84i (post-battle only)
  • Monsoon (pre-entry to Japanese garden reception only)
  • Steven Armstrong (elevator only)

Blade Wolf DLC:

Metal Gear Solid V: Ground Zeroes[]

Metal Gear Solid V: The Phantom Pain[]



See also[]

Notes and references[]

  1. ^ Metal Gear Solid: Peace Walker, Kojima Productions (2010).
    Kazuhira Miller: Snake, I rigged that radio so you can contact our young lady friend Paz. // Naked Snake (Big Boss): Is she OK? // Miller: No need to worry. She's tougher than you think... // Snake: Still just a kid. // Miller: Which is exactly why she could be an effective source of information. Besides, that little angel de la paz is the one who gave us this mission, right? // Snake: ...I guess. // Miller: I'll put her on. // Paz Ortega Andrade: Snake... // Snake: Paz. Where are you? // Paz: Ciudad Colón. A school. The teacher told me to stay here until things quiet down. // Snake: Teacher? Oh, him. He's... Yeah, that's probably good advice. // Paz: Si. He has a radio in his room, so we can talk anytime. // Snake: ...Pretty fancy for a teacher.
  2. ^ Metal Gear Solid 2: Sons of Liberty (script), Konami Computer Entertainment Japan (2001).
    Raiden is needlessly aggressive; he feels that his qualifications as a soldier have been belittled by Pliskin. At that moment, the Colonel checks in on the Codec. Raiden takes the call, back turned towards Pliskin. Pliskin cannot hear the dialogue since communication between the Colonel and Raiden is a silent, nanotech-based exchange. // Colonel: (OFF) Raiden ? What’s going on! // Raiden: The Alpha team from Navy SEAL 10 is dead -- (remembering Pliskin), no a single survivor. // Iroquois Pliskin: The kid’s wired with nanomachines.
  3. ^ Metal Gear Solid 2: Sons of Liberty (script), Konami Computer Entertainment Japan (2001).
    Iroquois Pliskin: Remember my frequency –- its 141.80. // Pliskin twists around to indicate the large radio on his left shoulder. // Pliskin: I’ve been briefed on this plant’s layout. If you need information on the place or about Dead Cell, contact me. // Raiden: 141.80. Got it. // Pliskin: You’re using nano communication, right? // Raiden: Yeah. But I can patch into your frequency.
  4. ^ Metal Gear Solid 2: Sons of Liberty (script), Konami Computer Entertainment Japan (2001).
    P050_02_M01 Sorting out the Tanker Chapter 2 movie demo 1 (Photos) Metal Gear Photos Snake displays the 4 photos taken by the player. The photos have been downloaded from the WEB. Snake’s voice plays over the picture data. Solid Snake: I took these photos two years ago... // Raiden: I know these pictures –- they were on the news, on several websites. If I can remember right, the reporters blamed you for sinking that tanker...
  5. ^ Metal Gear Rising: Revengeance, Kojima Productions/PlatinumGames Inc. (2013)
    This is explained in a Codec conversation with Boris during Chapter R03.
  6. ^ Metal Gear Rising: Revengeance, Kojima Productions/PlatinumGames Inc. (2013)
    This is demonstrated with Mistral's death scene, where Raiden listened in to Mistral's conversation with Dolzaev via a radio transmitter through the Codec.
  7. ^ Master Miller was seen wearing headsets when contacted during the Zanzibar Land Disturbance.
  8. ^ a b Metal Gear Solid 3: Subsistence version, "Controls."
  9. ^ Mission debriefings only.
  10. ^ Player initiated Codec calls only.
  11. ^
  12. ^
  13. ^
  14. ^
  15. ^
  16. ^ Metal Gear Solid 2: Sons of Liberty, Konami Computer Entertainment Japan (2001).
    In the Darkness of Shadow Moses: It's time, Nastasha," Richard called out as the call signal came on. The line was already live as I nodded to him and took my position. I could feel myself growing keener, more on edge. "This is Nastasha Romanenko. Good to meet you, Solid Snake." "You the nuke expert that the Colonel was talking about?" The voice that responded over the radio was, above all things, calm.
  17. ^
  18. ^ Solid Snake uses this frequency shortly after escaping Outer Heaven in the ending, and it is implied that he was contacting FOXHOUND headquarters in this call.
  19. ^ Only when the cigarettes are equipped.
  20. ^ Gray Fox will call Snake with this frequency as Snake is going up in the central elevator that leads to the 20th floor.
  21. ^ Campbell and Naomi share the same Codec frequency. After Campbell is arrested following the destruction of Metal Gear REX, Houseman will utilize the Codec himself and talk to Snake, although he will be listed as having Campbell and Naomi's frequency.
  22. ^ Shortly before the second battle with Sniper Wolf, Snake will call Otacon in order to find out about who was shooting at him in the snowfield. During this Codec conversation, Sniper Wolf will utilize the Codec herself and cut in on their conversation, although she will be listed as having Otacon's frequency.
  23. ^ The novelization for Metal Gear Solid had Master Miller suggesting that Solid Snake change his radio frequency to 23.7. Snake also notes that it was unusual as most frequencies start with a "1" in the hundreds digit.
  24. ^ VR missions only.
  25. ^ IdeaSpy 2.5 is only available in the Japanese and European versions of the game. Becomes accessible once the game is beaten once.
  26. ^ Metal Gear Solid: Portable Ops, Kojima Productions (2006).
    In certain areas of the game, a soldier that was recruited by Snake will call in using the frequency 140.85.
  27. ^ Snake only contacts Ocelot during a secret, non-canon recruiting mission.
  28. ^ Snake only contacts EVA during a secret, non-canon recruiting mission.
  29. ^ Slippy hacks into the Codec system and gives Snake information about Falco, for the sake of friendly competition.
  30. ^ Only during Peace Walker battle, and shares Miller's frequency.
  31. ^ Only during Peace Walker battle 3.
  32. ^ Only during Peace Walker battle 3.
  33. ^