SIM cards can also be used in satellite phones, smart watches, computers, or cameras. SIM cards are always used on GSM phones for CDMA phones, they are needed only for LTE-capable handsets. 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 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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