International Mobile Subscriber Identity (IMSI)
The IMSI is the unique number, stored on the SIM, that identifies a mobile subscriber to the network.
What is International Mobile Subscriber Identity (IMSI)?
An IMSI has up to 15 digits: a 3-digit mobile country code (MCC), a 2- or 3-digit mobile network code (MNC) and the subscriber number (MSIN). It is kept private where possible; networks use temporary identities over the air to protect it.