Communication device, communication device set, authentication method and method of wireless-connecting terminals

摘要

A communication device which can be freely inserted into and extracted from a slot of a terminal device has its part exposed from the terminal device when inserted into the slot applied a color according to a kind of the communication device and includes a radio unit adapted to a predetermined mobile communication service, applied a color according to a kind of the mobile communication service and storing information necessary for the connection to a specific provider.