Quick definition: “Multi-IMSI” is an abbreviation for Multiple International Mobile Subscriber Identities. An IMSI is a unique number that lets Mobile Network Operators authenticate their subscribers so they can access the MNO’s network—and any networks the MNO has established roaming agreements with.
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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:
What Is an International Mobile Subscriber Identity (IMSI)?
IMSI numbers are usually 15 digits, and they have three distinct parts:
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.