TCG(TD-SCDMA authentication group) is a national test for TD terminals. Only the terminals that pass the test can obtain the network access license.

The full name of TCG is "trading card game", that is, "changing card game", which is a card game in which cards with a specific theme are formed into their own pile and played with various cards and strategies.

1993 started the card game of "set and change" in August. At present, the most popular TCG in the world is the card game "magic the gathering" based on western myths and legends, and KONAMI's game king card (YU-GI-OH! Trading card games), many well-known role-playing games in Europe and America, such as Dungeons and Dragons, also have their own card systems.