النظام العالمي للاتصالات المتنقلة
MSISDN (pronounced as /'em es ai es di en/ or "MISS-den") is a number uniquely identifying a subscription in a Global System for Mobile communications or a Universal Mobile Telecommunications System mobile network. It is the mapping of the telephone number to the subscriber identity module in a mobile or cellular phone. This abbreviation has several interpretations, the most common one being "Mobile Station International Subscriber Directory Number".