IMSI (International Mobile Station Identity)

From NENA Knowledge Base

An international mobile subscriber identity (IMSI) is a unique number, usually fifteen digits, associated with Global System for Mobile Communications (GSM) and Universal Mobile Telecommunications System (UMTS) network mobile phone users. The IMSI is a unique number identifying a GSM subscriber.

www.techopedia.com/definition/5067/international-mobile-subscriber-identity-imsi

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