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.

A.
001451548

B.
245252

C.
44

D.
89