Mobile Subscriber Integrated Services Directory Number definition communications
A number string used to uniquely identify a mobile telephone subscriber in GSM
cellular networks. The number is formatted according to the E.164 numbering plan, consisting of a country code (CC), national destination code (NDC) and subscriber number (SN).
See also: IMSI, IMEI, The GSM Specifications (http://www.etsi.org/services_products/freestandard/home.htm).