![]() ![]() ![]() It is also possible to store contact information on many SIM cards. A TracFone Wireless SIM card has no distinctive carrier markings and is only marked as a "SIM card"Ī SIM card, also known as subscriber identity module or subscriber identification module ( SIM), is an integrated circuit running a card operating system (COS) that is intended to securely store the international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephony devices (such as mobile phones and computers).
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