On June 23, 2000, Bandai announced a communication adapter for the WonderSwan. The device would allow the WonderSwan to be connected to a smartphone to provide network communication capability.
A special cartridge included in the package include a browser (with HTML 3.2 support), a e-mail client and support to download (32kb) mini games.
Some games, such as Digimon Adventure 02 supported the Mobile Wonder Gate to add features, such as additional content or network ranking. The Digimon Adventure 02 was available as a bundle with the Mobile Wonder Gate.