Your SIM serial number (SSN), sometimes called the ICC-ID (Integrated Circuit Card ID), is for international identification. The SNN typically has 19 digits and contains specific details about your operator, your location, and when it was made. The first two digits are the telecom ID, the second two digit refer to your country code, the third two digits are the network code, the next four digits are the month and year of manufacturing, the next two digits are the switch configuration code, the next six digits are the SIM number, and the last digit is the check digit.
The number is composed of the following subparts:
Issuer identification number (IIN)
Maximum of seven digits:
- Major industry identifier (MII), 2 fixed digits, 89 for telecommunication purposes.
- Country code, 1–3 digits, as defined by ITU-T recommendation E.164.
- Issuer identifier, 1–4 digits.
Individual account identification
- Individual account identification number. Its length is variable, but every number under one IIN will have the same length.
- Single digit calculated from the other digits using the Luhn algorithm.
With the GSM Phase 1 specification using 10 octets into which ICCID is stored as packed BCD, the data field has room for 20 digits with hexadecimal digit "F" being used as filler when necessary.
In practice, this means that on GSM SIM cards there are 20-digit (19+1) and 19-digit (18+1) ICCIDs in use, depending upon the issuer. However, a single issuer always uses the same size for its ICCIDs.
To confuse matters more, SIM factories seem to have varying ways of delivering electronic copies of SIM personalization datasets. Some datasets are without the ICCID checksum digit, others are with the digit.
As required by E.118, The ITU regularly publishes a list of all internationally assigned IIN codes in its Operational Bulletins. The most recent list, as of November 2013, is in Operational Bulletin No. 1040.
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