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The Integrated Circuit Card Identifier (ICCID) is a number to international identify callers, called a 'Primary Account Number', used i.a. in SIM cards including eSIM cards. Its layout is based on ISO/IEC 7812. [4] The ICCID is made up of: Issuer identification number (IIN) Maximum of seven digits:
According to E.118, the number can be up to 19 digits long, including a single check digit calculated using the Luhn algorithm. However, the GSM Phase 1 [20] defined the ICCID length as an opaque data field, 10 octets (20 digits) in length, whose structure is specific to a mobile network operator. The number is composed of three subparts:
The check digit is computed as follows: Drop the check digit from the number (if it's already present). This leaves the payload. Start with the payload digits. Moving from right to left, double every second digit, starting from the last digit. If doubling a digit results in a value > 9, subtract 9 from it (or sum its digits).
The last number of the IMEI is a check digit, calculated using the Luhn algorithm, as defined in the IMEI Allocation and Approval Guidelines: The Check Digit shall be calculated according to Luhn formula (ISO/IEC 7812). (See GSM 02.16 / 3GPP 22.016). The Check Digit is a function of all other digits in the IMEI.
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).
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E.214 provides a method to convert the IMSI into a number that can be used for routing to international SS7 switches. E.214 can be interpreted as implying that there are two separate stages of conversion; first determine the MCC and convert to E.164 country calling code then determine MNC and convert to national network code for the carrier's ...
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