The first UICC smart cards were the size of credit and bank cards sizes were reduced several times over the years, usually keeping electrical contacts the same, so that a larger card could be cut down to a smaller size.Ī SIM card contains a unique serial number ( ICCID), international mobile subscriber identity (IMSI) number, security authentication and ciphering information, temporary information related to the local network, a list of the services the user has access to, and two passwords: a personal identification number (PIN) for ordinary use, and a personal unblocking key (PUK) for PIN unlocking. SIM cards are transferable between different mobile devices. The SIM circuit is part of the function of a universal integrated circuit card (UICC) physical smart card, which is usually made of PVC with embedded contacts and semiconductors. 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 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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