What Is an ICCID Number?
Mobile Network Operators (MNOs) use ICCID numbers to determine which network to connect a subscriber to. Unlike an IMEI number, which refers to the mobile device, an ICCID number refers to the SIM card itself. Since each SIM card has a unique ICCID, you may sometimes hear it called the SIM card number.
What Is an MSISDN?
The abbreviation MSISDN is a little ambiguous. Major telecommunications organizations and standardization bodies have slightly different terms with this same abbreviation, but they all represent the same thing. Depending on the source and context, MSISDN can stand for: