SIM Serial Number

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The Subscriber Identity Module Serial Number (SSN), or Integrated Circuit Card ID (ICC-ID), is a 19 or 20 digit unique number that identifies an individual SIM card used in GSM and 3G phones. The number is printed onto the SIM card.

The exact format of the SSN differs according to the mobile operator, however the following is constant:

The first 3 digits represents the Mobile Country Code (MCC).
The next 2 digits represent the Mobile Network Code (MNC, i.e. the mobile operator).
The next 12 digits is the number, from which some operators use the two left most to indicate the Home Location Register.
The 20th digit then is a checksum.

The numbering of the ICC-ID is based on International Standard ISO/IEC 7812. The maximum length of the visible card number is 20 characters; 19 digits are preferred, but telecommunication network operators who are already issuing Phase 1 SIM cards with an identification number length of 20 digits may retain this length. The number is composed of the following subparts:

Issuer Identification number (max. 7 digits)