IoT Glossary
IMSI (International Mobile Subscriber Identity)
The IMSI is the unique identifier of user on a network. SIM cards can have multiple IMSIs, but each IMSI on a network identifies a unique SIM card (the IMSIs are stored in the HLR/VLR for the network). The IMSI the primary key to each for each HLR record. IMSI = MCC + MNC + MSIN.