Subscriber Identity Module (SIM) is a removable component that contains essential information about the subscriber. Its main function entails authenticating the user of the cell phone to the network…

Subscriber Identity Module (SIM) is a removable component that contains essential information about the subscriber. Its main function entails authenticating the user of the cell phone to the network to gain access to subscribed services. SIM contains a 20-digit long Integrated Circuit Card identification (ICCID) number, identify the issuer identifier Number from the ICCID below.