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International Mobile Subscriber Identity (IMSI)
Definition
(Context: Technology Management)
A number that uniquely identifies every user of a cellular network. It is stored as a 64-bit field and is sent by the mobile device 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.
Reference:
https://www.vita.virginia.gov/media/vitavirginiagov/it-governance/ea/pdf/Event-Log-Management.pdf