What is SIM card?
SIM card means Subscriber Identity Module which is a small circuit board. Actually SIM card is placed in your GSM phone in order to identify it to your carrier. You can swap SIMs in GSM phones and your phone number, voice, and data plans are swapped right along with the help of SIM card. A SIM card is usually identified by its Integrated circuit card identifier that is engraved on the body of the card of a SIM.
SIM, How to use SIM card? & How does SIM card work?
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