The
International Mobile Subscriber Identity or
IMSI is used to identify the user of a
cellular network and is a unique identification associated with all cellular networks. It is stored as a field and is sent by the phone to the network. It is also used for acquiring other details of the mobile in the
home location register (HLR) or as locally copied in the
visitor location register. To prevent
eavesdroppers identifying and tracking the subscriber on the radio interface, the IMSI is sent as rarely as possible and a randomly generated
TMSI is sent instead.