Integrated Circuit Card Identifier (ICCID) is a globally unique electronic serial number that can be used to identify the SIM card. SIM cards contain various numbers such as the International Mobile Subscriber Identity( IMSI).
The ICCID number, also known as the SIM Serial Number, consists of 15 to 20 characters and can be extracted from the Hayes command set using the ATcommand. Since not all smartphone operating systems support the display of the ICCID number, the ICCID can also be accessed via the special SIM card tool. Generally, the ICCID is printed on the SIM card.