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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).
A typical SIM card (mini-SIM with micro-SIM cutout) A SIM (Subscriber Identity Module) card 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).
In 2G networks, the SIM card and SIM application were bound together, so that "www SIM card" could mean the physical card, or any physical card with the SIM application. In a GSM network, the UICC contains a SIM application and in a UMTS network, it contains a USIM application. A UICC may contain several applications, making it possible for the ...
An ID-1 size card containing an ID-000 size card is denoted as ID-1/000. This was the common design of SIMs when mini-SIMs were common, usually being issued as standard SIMs, i.e. in ID-1 format, with a removable ID-000 section that, when removed, was a mini-SIM.
The SIM securely stores the service-subscriber key (IMSI) used to identify a subscriber on mobile telephony devices (such as mobile phones and computers). The SIM card allows users to change phones by simply removing the SIM card from one mobile phone and inserting it into another mobile phone or broadband telephony device.
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Multi-SIM technology allows cloning up to 12 GSM SIM cards (of format COMP128v1) into one card. The subscriber can leave the original cards in a secure place and use only the multi-SIM card in day to day life. For telecom operator-provided cards, only the Group MSISDN number is known to multi-SIM subscribers.
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