USIM
Universal Subscriber Identity Module. An IC card used for UMTS the shape of which is the same as that of the SIM card of GSM. USIM is provided by network operator, and carries the authentication and service grade data for the network operator as well as
Video call
A communications service that enables users to talk watching each other over a 64Kbps data channel.
Voice mail
Computerised answering service that automatically answers your calls when you are not available, plays a greeting and records a message.
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