Keitai Denjuu Telefang 2 is the Game Boy Advance sequel to the first Telefang game. Taking place in a different part of the Denjuu world from the first one, this game shares some qualities with Telefang 1. The battle system is similar, as is the gathering-phone-numbers system, but a good deal of things are quite different from the original.
The game follows a blue-haired protagonist (named by the player, but originally called Kyou) as he journeys on his quest to become a T-Fanger. Along the way, he encounters Diabolos, who is not content with humans entering the Denjuu universe and so is killing off the Antenna Trees, thereby cutting off access to the Human World.