A SIM card is short for Subscriber Identity Module card. It is a tiny encoded circuit board that is fitted into GSM cell phones at the time of signing on as a subscriber. The sim card holds the details of the subscriber, security data, and memory to store personal numbers. A SIM card stores information which helps the network service provider to recognize the caller.
A SIM card is a removable memory card and can be put into any compatible GSM handset, permitting the user to keep the same number while changing handsets. It is a standard unique chip which is a must in every GSM cell phone.
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