Keitai Denjū Telefang (Japanese: 携帯電獣テレファング, Hepburn: Keitai Denjū Terefangu, lit. "Mobile Phone Beast Telefang") is a series of role-playing video games (RPGs) developed by Natsume and published by Smilesoft. In the games, the player contacts various creatures using a mobile phone-like device in order to get them to battle the foes he or she will encounter. Released exclusively in Japan on November 3, 2000, the first game in the series was released for the Game Boy Color in two versions: Power Version (パワーバージョン, Pawā Bājon) and Speed Version (スピードバージョン, Supīdo Bājon). Each version features several exclusive creatures. The name of the series derives from keitai (携帯), the Japanese term for mobile phone, as making phone calls to the creatures is an integral part of the games, and fang, to sy