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A subscriber identity module or subscriber identification module (SIM), widely known as a SIM card, is an integrated circuit that is intended to securely store the international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephony ...
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A SIM card is otherwise known as a subscriber identity module and is used in smartphones globally. It is a smart card which stores data for subscribers of GSM cellular phones. ... Phones on the GSM network can use any carrier's network, lowering the costs for the carriers and its users
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