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The ICCID (Integrated Circuit Card Identifier) identifies each SIM internationally. A full ICCID is 19 or 20 characters. It is possible to extract the ICCID by using the 'AT!ICCID?' modem command.
The format of the ICCID is: MMCC IINN NNNN NNNN NN C x
- MM = Constant (ISO 7812 Major Industry Identifier, = 89 for "Telecommunications administrations and private operating agencies")
- CC = Country Code (i.e. 61 = Australia, 86 = China)
- II = Issuer Identifier (AAPT = 14, EZI-PhoneCard = 88, Hutchison = 06, Optus = 02/12/21/23, Telstra = 01, Telstra Business = 00/61/62, Vodafone = 03)
- N{12} = Account ID ("SIM number")
- C = Checksum calculated from the other 19 digits using the Luhn algorithm.
- x = An extra 20th digit is returned by the 'AT!ICCID?' command, but doesn't seem to be an official part of the ICCID.