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Mobile Adapter GB

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Boxart of the Mobile Adapter GB package

The Mobile Adapter GB (Japanese: モバイルアダプタGB Mobile Adapter GB) is a peripheral for the Game Boy Color, released exclusively in Japan on January 27, 2001 which allows players to connect to compatible Japanese mobile phones. It is also compatible with the Game Boy Advance and Game Boy Advance SP. The peripheral was a collaboration between Nintendo and Mobile21, a company that was jointly owned by Nintendo and Konami.

As a part of a service known as Mobile System GB (Japanese: モバイルシステムGB Mobile System GB), the Mobile Adapter provided the hardware to compatible games, which used the network for wireless play across the nation via the now defunct server, hosted by Nintendo Network Service Development. KDDI was the internet service provider of the Mobile System GB's network. The most well-known Mobile System GB is the Pokémon Mobile System GB used in the Japanese releases of Pokémon Crystal and Pokémon Stadium 2.

It was first released with a recommended retail price of ¥5800, before a price cut to ¥3800 from July 19, 2001.[1] Despite its promises, the service was not much of a commercial success and closed down in December 14, 2002[2], probably due to its high price, the additional costs involved and a general unwillingness of players to connect their phones to play games. The closure of the Mobile System GB service makes it impossible for players to link to the server; however, it is still possible to link with friends provided that a peer-to-peer network is used.

The Mobile Adapter GB was not the first Game Boy peripheral offering online play. From as early as March 6, 1998, Hudson Soft's GB Kiss Link Modem allowed players to access downloadable content from the Internet and send messages between friends, through a number of compatible games which had built-in infrared ports, such as Nectaris GB, the Japanese versions of Robopon for the Game Boy Color, as well as the GB Kiss Minigames cartridge which came packaged with the GB Kiss Link Modem. The Link Modem was available through mail order.


The package was bundled with the original Mobile Adapter GB itself, which was a blue cable that could be used to connect to compatible Japanese mobile phones. Included with the Mobile Adapter GB is the "Mobile Trainer" cartridge, that only boots up when the Mobile Adapter GB is connected to a compatible Japanese mobile phone. A special edition of the Mobile Adapter GB came packaged with Mobile Golf, which was a spin-off to the Mario Golf series used to test the Mobile Adapter GB. After the Mobile Adapter GB's release, different colored cables were sold separately which allows the player to connect to different types of phones, one of which was announced but never released.


The blue cable

In addition to the blue Mobile Adapter GB cable, three other cables were announced, all of which were sold separately, apart from the green adapter, which was never released. They all allowed the player to connect to different types of phones.

  • Blue: the original cable packaged with the Mobile System GB. Supports connections to a digital cell phone terminal PDC. The cable allowed for a maximum bit rate of 9600 bps.
  • Yellow: this cable connects to a cdmaOne mobile phone, allowing for a maximum bit rate of 14.4 kbps.
  • Red: this cable connects to a DDI mobile phone, with a maximum bit rate of 36.6 kbps.
  • Green: this cable would have support PHS devices from Astel and NTT DoCoMo, but it was ultimately never released.

Mobile Trainer

The Mobile Trainer cartridge.

Mobile Trainer (Japanese: モバイルトレーナー Mobile Trainer) is a cartridge which came packaged with the Mobile Adapter GB itself, developed by MissingLink, the parent company of Denyusha.[3] Prior to its release, it was previously given the tentative name of Mobile Starter Cartridge (Japanese: モバイルスターターカートリッジ Mobile Starter Cartridge).[4] The cartridge served as a general guide to the Mobile System GB, which included a help menu about how to use the service and a glossary of key terms. Under a mobile settings menu, the player was able to alter their registration details, and confirm their remaining balance.

When the player boots up the cartridge, a connection screen checks whether the Mobile Adapter GB is connected. The software will progress past the loading screen only once connected to a compatible Japanese mobile phone. The cartridge offered an email system in which users could exchange text messages between each other. Another feature of the Mobile Trainer cartridge was access to the Mobile System GB homepage, which published featured articles around different compatible titles.

In the internal data of the Mobile Trainer ROM, graphics for Pokémon such as Pikachu, Porygon2 and Tyranitar have been found. The purposes of these graphics are unknown. It may be of note that Tyranitar uses artwork which more closely resembles its initial design from the early development of Pokémon Gold and Silver.

By ChickasaurusGL
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List of compatible software

Below is a list of all known Game Boy Color and Game Boy Advance software which supported the Mobile System GB.[5]

English title Japanese title Console Developer
Mobile Trainer モバイルトレーナー Mobile Trainer Game Boy Color MissingLink/Nintendo
Pokémon Crystal ポケットモンスタークリスタルバージョン Pocket Monsters: Crystal Version Game Boy Color Game Freak/Nintendo
Napoleon ナポレオン Napoleon Game Boy Advance Genki/Nintendo
Mobile Golf モバイルゴルフ Mobile Golf Game Boy Color Camelot Software Planning/Nintendo
Game Boy Wars 3 ゲームボーイウォーズ3 Game Boy Wars 3 Game Boy Color Hudson Soft/Nintendo
Mail de Cute メールでキュート Mail de Cute Game Boy Color Mobile21/Konami
Hello Kitty: Happy House ハローキティのハッピーハウス Hello Kitty: Happy House Game Boy Color MTO
Mario Kart: Super Circuit マリオカートアドバンス Mario Kart Advance Game Boy Advance MTO
Horse Racing Creating Derby[6] (cancelled) 馬穴大作戦[7][8] (cancelled) Game Boy Advance
beatmaniaGB Net Jam (cancelled) beatmaniaGBネットジャム beatmaniaGB Net Jam (cancelled) Game Boy Color
Japan GT Championship 全日本GT選手権 All-Japan GT Championship Game Boy Advance Vision Works/Kemco
Silent Hill: Play Novel プレイノベル サイレントヒル Play Novel: Silent Hill Game Boy Advance Konami
Daisenryaku for Game Boy Advance 大戦略 For ゲームボーイアドバンス Daisenryaku For Game Boy Advance Game Boy Advance SystemSoft Alpha/MediaKite
Doraemon: Midori no Wakusei Doki Doki Daikyūshūtsu! ドラえもん 緑の惑星ドキドキ大脱出 Game Boy Advance Mobile21/Epoch
Monster Guardians モンスターガーディアンズ Monster Guardians Game Boy Advance Mobile21/Konami
Net de Get Minigames @100 ネットでゲットミニゲーム@100 Net de Get minigames @100 Game Boy Color Mobile21/Konami
Zero Tours ゼロ・ツアーズ Zero Tours Game Boy Advance Amedio/Media Rings
Sutakomi: Star Communicator スタコミStar★Communicator Game Boy Advance Konami
Kinniku Banzuke ~Kongou-Kun no Daibouken~ 筋肉番付~金剛くんの大冒険~ Game Boy Advance KCE Studios/Konami
Morita Shogi Advance 森田将棋あどばんす Game Boy Advance Yuki Enterprise/Hudson Soft
EX Monopoly EXモノポリー EX Monopoly Game Boy Advance Mobile21/Takara
Exciting Bass エキサイティングバス Exciting Bass Game Boy Advance Konami
JGTO Golf Master Mobile JGTO公認GOLF MASTERモバイル JGTO Licensed: GOLF MASTER Mobile Game Boy Advance Konami
Mobile Pro Baseball モバイルプロ野球: 監督の采配 Mobile Pro Baseball: Control Baton Game Boy Advance Mobile21/Konami

Pokémon Mobile System GB

Main article: Pokémon Mobile System GB

The most well-received division of the service was the Pokémon Mobile System GB service used in the Japanese versions of Pokémon Crystal and Pokémon Stadium 2, which ran up to when the whole Mobile System GB service went defunct in December 14, 2002.


  1. DMG/MGB/CGB: Game Boy Series
  2. モバイルシステムGB (via Internet Archive)
  3. ShadowFlare
  4. モバイルトレーナー
  5. モバイルシステムGB対応ソフト
  6. Horse Racing Creating Derby - IGN
  7. ファミ通.com ゲーム/馬穴大作戦
  8. Game - Baketsu Daisakusen (Horse Racing Game) (via Internet Archive)

External links

Communications media
Gen I Game Link CableTransfer Pak
Gen II  Game Link CableInfraredTransfer PakMobile Adapter GB
Gen III Game Link CableWireless AdapterDual-slot mode
Gen IV DS WirelessWi-FiDual-slot modeInfrared
Gen V DS WirelessWi-FiInfrared
Gen VI Nintendo NetworkInfrared

Project Games logo.png This game mechanic article is part of Project Games, a Bulbapedia project that aims to write comprehensive articles on the Pokémon games.