MOBILE STATION INTEGRATED SERVICES DIGITAL NETWORK

In 3GPP terminology, 'MSISDN' (Mobile Subscriber ISDN Number) refers to the telephone number of a mobile subscriber. The MSISDN follows the numbering plan defined in the ITU-T recommendation E.164.
The abbreviation 'MSISDN' stands for Mobile Station International ISDN Number (where ISDN stands for Integrated Services Digital Network).
While the above looks like it contradicts itself by saying MS stands for Mobile Subscriber and that MS stands for Mobile Station both are in fact correct, depending on the context. Also note that the MSISDN # is not always the telephone number.

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MSISDN format

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MSISDN format

MSISDN by ITU-T is at most 15 digits long and consists of:

★ 'CC' - Country Code ( 1-3 digits e.g."420" for Czech Republic)

★ 'NDC' - National Destination Code (e.g. 3 digits in Czech Republic)

★ 'SN' - Subscriber Number (e.g. 6 remaining digits (123456))
MSISDN example:

CC	NDC	SN
420	603	123 456

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★ Mobile phone

★ SIM card

★ IMSI

★ IMEI