What is a SIM Card? - Lifewire
https://www.lifewire.com/what-are-sim-cards-577532
WEBMay 16, 2021 · A SIM card, also called a subscriber identity module or subscriber identification module, is a small memory card that contains unique information that identifies it to a specific mobile network. This card allows subscribers to use their mobile devices to receive calls, send SMS messages, or connect to mobile internet services.
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