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- IMSI stands for International Mobile Subscriber Identity.
- It is a unique 15-digit code used to identify an individual user on a GSM network. It's like a SIM card serial number. Any association with the phone number (MSISDN) that corresponds to it happens on the network side (i.e., operator's servers). ( An exception : MTN South Africa's IMSIs are 14 digits)
- It is associated with all GSM and Universal Mobile Telecommunications System (UMTS) network mobile phone users.
- The IMSI consists of three components:
A) Mobile Country Code (MCC) B) Mobile Network Code (MNC) C) Mobile Subscriber Identity Number (MSIN)