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SIM Card
Jan 03, 2018

SIM Card (Subscriber identification Module), also known as user identification Card, smart card, GSM digital mobile phone must be installed on this card to be used.

On the computer chip store the digital mobile phone customer's information, the encrypted key and the user's telephone book and so on content, may provide for the GSM network customer identity to authenticate, and the customer calls the voice information to encrypt.

The SIM consists of CPU, ROM, RAM, EEPROM, and I/O circuits. When a user uses a Sim, it is actually a mobile phone issuing a command to the SIM card, which should be executed or rejected according to the standard specification; The SIM card is not a simple information memory.

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