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E.118 is an international standard that defines the international telecommunication charge card, for use in payphones. [1] It also defines the Integrated Circuit Card Identifier (), which is used in Subscriber Identity Modules (SIMs, including SIM cards and eSIMs. [2]
It is also used for acquiring other details of the mobile in the home location register (HLR) or as locally copied in the visitor location register. To prevent eavesdroppers from identifying and tracking the subscriber on the radio interface, the IMSI is sent as rarely as possible and a randomly-generated TMSI is sent instead.
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).
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The iPhone X and later, with the exception of the iPhone SE series, do not have a Home button, and include Face ID in place of Touch ID, a facial recognition authentication method. [8] A multi-function sleep/wake button is located on top of the device on earlier models, and on right of the device from iPhone 6 onwards.
The IMSI is often used as a key in the home location register ("subscriber database") and the MSISDN is the number normally dialed to connect a call to the mobile phone. A SIM has a unique IMSI that does not change, while the MSISDN can change in time, i.e. different MSISDNs can be associated with the SIM.
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The Long Form EUIMID is the ICCID that has been present in many generations of smart cards, including the SIM cards for GSM. This is composed of up to 18 BCD digits -- up to 72 bits. The storage allocated for the ICCID is, however, 80 bits, so it is recommended that the Luhn check digit be included plus a padding digit (0xf).