The ICCID (Integrated Circuit Card Identifier) is a fundamental and unique identifier associated with a SIM (Subscriber Identity Module) card used in mobile devices. This identifier plays a crucial role in the authentication and identification process within a mobile network.

The ICCID is a 19- or 20-digit string of numbers and is usually printed on the SIM card itself. Each segment of the ICCID has a specific meaning:

Issuer Identification Number (IIN): The initial six digits represent the IIN, identifying the organization or entity that issued the SIM card.

Individual Account Identification: The following two digits represent the individual account identification number.

Check Digit: The 19th (or 20th) digit is a check digit for error detection.

The ICCID is vital for various network operations, including identifying the mobile carrier associated with the SIM card, determining its type (e.g., prepaid or postpaid), and facilitating the provisioning and management of mobile services for the subscriber.

Understanding the ICCID is essential for telecommunications professionals, mobile network operators, and those involved in managing and providing mobile services. It ensures effective handling of SIM cards and the optimization of mobile network operations.