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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).
Four example SIM card sizes that use the ISO/IEC 7816 interface. Created in 1988, updated in 1999, amended in 2004, updated in 2007. The standard defines an eight (or six) pin interface; the first pin is located at the bottom-right corner for the image given.
Along with the M6088, it was the only StarTAC to use a mini-SIM card (2FF). All other GSM models used a full-sized SIM card (1FF), the size of a standard debit/credit card meeting ISO/IEC 7810 specifications. On the used market there are many 130 models that are sold as dual-band, operating on GSM 900 and 1800. These can be identified by the ...
Some phone models utilize a "hybrid" SIM tray, which can hold either two SIM cards, or one SIM card and one MicroSD memory card. [31] [32] The Huawei Mate 20 range introduced a proprietary memory card format called Nano Memory, exactly the size and shape of a nano SIM card. [33] Some devices accept dual SIMs of different form factors.
The cards are essentially full-size SDHC or SDXC UHS-II cards, rated at UHS Speed Class U1. [39] [40] An adapter allows MicroP2 cards to work in current P2 card equipment. [41] Panasonic MicroP2 cards shipped in March 2013 and were the first UHS-II compliant products on market; initial offer includes a 32 GB SDHC card and a 64 GB SDXC card.
An Answer To Reset (ATR) is a message output by a contact Smart Card conforming to ISO/IEC 7816 standards, following electrical reset of the card's chip by a card reader. The ATR conveys information about the communication parameters proposed by the card, and the card's nature and state.