Global System for Mobile Communication,
GSM Wireless DEFINITION: A SIM card, also known as a subscriber identity module, is a smart cardthat stores data for GSMcellulartelephone subscribers. Such data includes user identity, location and phone number, networkauthorization data, personal security keys, contact lists and stored text messages. Securityfeatures include authenticationand encryptionto protect data and prevent eavesdropping.A SIM card and can be switched
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