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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]
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).
The international mobile subscriber identity (IMSI; / ˈ ɪ m z iː /) is a number that uniquely identifies every user of a cellular network. [1] It is stored as a 64-bit field and is sent by the mobile device to the network.
MSISDN (/ ˈ ɛ m ɛ s aɪ ɛ s d iː ɛ n / MISS-den) is a number uniquely identifying a subscription in a Global System for Mobile communications or a Universal Mobile Telecommunications System mobile network.
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).
The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices.. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM, UMTS, LTE, 5G NR, iDEN, Iridium or other IMEI-employing wireless network.
SID/NID Lockout List. SIP – Session Initiation Protocol SMS – Short Message Service SMSC – Short Message Service Centre – See SMS. Soft Handoff. SO33 – Service Option 33 – See Service Option. SO59 – Service Option 59 – See Service Option. SPC – Service Programming Code, same as MSL (Master Subsidy Lock)
There are two standard formats for MEIDs, and both can include an optional check-digit. This is defined by 3GPP2 standard X.S0008.. The hexadecimal form is specified to be 14 digits grouped together and applies whether all digits are in the decimal range or whether some are in the range 'A'–'F'.