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ICC ID Format

If you’ve ever wondered about the format of the number on your SIM card (ICC ID), here it is:

The format of the ICCID is: MMCC IINN NNNN NNNN NN C x


MM= Constant (ISO 7812 Major Industry Identifier)
CC = Country Code
II= Issuer Identifier
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 it is not officially part of the ICCID.

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