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A typical SIM card (mini-SIM with micro-SIM cutout) A SIM card or SIM (Subscriber Identity Module) is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone devices (such as mobile phones and laptops).
English: A break-apart SIM Card showing the original SIM size (full image), a Mini-SIM size, and a Micro-SIM size card. It is meant as a comparison of GSM Micro-SIM vs. Mini-SIM Cards. The Micro-SIM card is also known as Third Form Factor (3FF).
The phone accepted a 2FF mini SIM card behind the battery for mobile network connectivity. The StarTAC D was the world's first dual-sim mobile phone. The StarTAC D was released following a partnership between Barclaycard and Cellnet in the UK, and also France Telecom and Cartes Bancaires in France .
A GSM module works by connecting to the GSM network through a SIM card. The SIM card provides the module with a unique identification number, which is used to identify the device on the network. The GSM module then communicates with the network using a set of protocols, which allows it to send and receive data.
XM (requires an eXternal electro-mechanical adapter) – Technically the same as EM, but such adapter usually consists of 2 parts: a pseudo-card with pin routing and physical enclosure size that perfectly match the target slot and a break-out box (a card reader) that holds a real card. Such adapter is the least comfortable to use.
The first SIM card was made in 1991 by Munich smart card maker Giesecke & Devrient for the Finnish wireless network operator Radiolinja. [citation needed] A hybrid mobile phone can hold up to four SIM cards, with a phone having a different device identifier for each SIM Card. SIM and R-UIM cards may be mixed together to allow both GSM and CDMA ...