![]() If you change phones, as long as you keep the SIM card, these contacts and text messages will come with you to the new phone. ![]() SIM cards can carry a great deal of data, like your contact list and text messages. These let the network know what your phone number is, and what phone carrier you use (T-Mobile, Verizon, etc.). Most SIM cards are provided by phone companies, and contain some basic identifying information like serial numbers and identifying codes. A SIM card identifies you on the wireless network.
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