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Keitai Denjuu Telefang, also known as Telefang 1 (since there are two games in this series), is a video game for Game Boy Color released by Smilesoft in Japan. It is available in two versions, Power and Speed.
Telefang is a monster-collecting RPG with monsters known as Denjuu that live in a world called the Denjuu World. These Denjuu have cellphones called D-Shots and they battle each other. They can befriend T-Fangers, people who specialize in handling and befriending Denjuu and having them battle other Denjuu. Shigeki, the protagonist, is one such T-Fanger. When arriving to the Denjuu World, Shigeki is determined to befriend Denjuu to solve the various problems in the Denjuu World that crop up from time to time. Shigeki starts with the Denjuu Crypto in Power Version and Fungus in Speed Version, and from there, befriends and battles other Denjuu.

In a battle, a T-Fanger can have from one to three Denjuu to battle. They bring Denjuu by calling them. A T-Fanger will always have one Denjuu with them, but the other two have to be called in order to have them battle. The better the coverage on the T-Fanger's D-Shot, the more Denjuu they can use in battle. Also, depending on the T-Fanger's location, some Denjuu will be close by, but others will be so far away that they may take multiple turns to arrive. This can serve an important role in deciding which Denjuu to pick, and can be a tough decision to make when stronger Denjuu live farther away than weaker Denjuu. Also, Shigeki can see the opponent's Denjuu ahead of time, which can affect his decision on which Denjuu to use.

Each Denjuu has a certain habitat type (out of 6), which affects the damage done to other Denjuu. All of a Denjuu's moves are the same as their type. Depending on the matchup against another Denjuu, a Denjuu's attacks can do either greater damage than usual, or less damage than usual. The type matchups are a 6-way rock-paper-scissors chain: Forest Forest > Aquatic Aquatic > Desert Desert > Grassland Grassland > Mountain Mountain > Sky Sky > Forest. Due to the nature of 3-on-3 battles, a Denjuu can have a type that covers the weaknesses of a teammate's Denjuu, making some battles interesting.
In the year 2020 it has become possible to travel to the Denjuu world using D-Shots, special mobile phones. Making friends and sharing telephone numbers with Denjuu has become popular among humans.

The protagonist, Shigeki, despite having originally arrived in the Denjuu world by accident, becomes determined to travel the world with his new Denjuu companion, and make more new friends while he is there.
The game was not released in English, and is best known among English audiences for the a bootlegged game version which was hacked and sold as a fake Pokémon game.