Definitions for "SIM CARD"
Mobile SIM stands for Subscriber Identity Module, and a SIM card is a small memory chip that can store between 16k and 64k worth of data. The SIM card is inserted into a mobile phone handset and is required for the phone to talk to the network operator (e.g. Vodafone, o2, etc). The chip contains a unique ID (known as an IMSI) that network operator uses to identify you and your handset to the network. There's also storage space for SMS text messages and address book information.
Subscriber Identity Module card; a small printed circuit board that needs to be installed in a GSM terminal before use. The card contains subscription details, security information and a memory for a personal telephone number register.
Subscriber identification module. Small smart cards that store user information (numbers, network activation etc) for GSM phones.
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