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How does a SIM card work?In: Mobile Phones, iPhone
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A SIM (Subscriber Identity Module) Card works by storing information about your phone service (e.g. your phone number) so that the phone it is inserted into knows what service and account to use.
First answer by Cybiko123. Last edit by Cybiko123. Contributor trust: 303 [recommend contributor]. Question popularity: 142 [recommend question].
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