what is sim card?? how does it work and who made it?
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A SIM card, also known as subscriber identity module or subscriber identification module, is an integrated circuit running a card operating system that is intended to securely store the international
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SIM cards link a certain account to a certain phone; they tell the phone network company which account is joined up to which person's phone. Phone network companies usually call customers “subscribers”. A SIM card is a customer card that lets your phone connect to the network. These towers allow us to make phone calls.
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