SIM – Subscriber Identity Module

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SIM card
SIM card graphical illustration

A SIM card contains a unique information which identifies a specific mobile network for allowing communication with the device. It contains information such as user identity, location, network authorization data, contact lists, personal security keys, and stored text messages. It can be switched easily from one set to another even when the phone runs out of battery. SIM card is most commonly used in GSM and UMTS headsets but CMDA mobiles cannot use SIM card.

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