What is a SIM card used for? A SIM card, or a subscriber identity module/subscriber identification module, is a tiny memory card that contains unique information and is linked to a particular network ...

If your new phone no longer supports SIM cards, or you don't want to use them anymore, you can convert to eSIM instead.

A SIM card is a unique identifier in every cell phone that enables the device to connect to wireless networks in order to text and make calls. An eSIM refers to an “embedded” SIM, or a card that is ...

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