Mobile Station International Subscriber Directory Number (MSISDN)

The MSISDN (Mobile Station International Subscriber Directory Number) is a number that uniquely identifies a mobile phone number across the world. It specifies a GSM or UMTS mobile network subscription.

This number has a country code as well as a National Destination Code (NDC) that identifies the subscriber’s network operator. An MSISDN can have a maximum of 15 digits.