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What Is IMSI Number?

Every modern smartphone that uses a SIM card has some unique numbers that identify users and mobile operators. While your phone registers to the mobile network it sends its unique code called IMSI. This code is used to identify you as network subscriber. What is this number for? Why do you need to know it? How IMSI differs from TMSI? Let’s answer these and other questions.

What Is TAC and FAC Terms

Every modern smartphone that uses a SIM card has some unique numbers that identify users and mobile operators. While your phone registers to the mobile network it sends its unique code called IMSI. This code is used to identify you as network subscriber. What is this number for? Why do you need to know it? How IMSI differs from TMSI? Let’s answer these and other questions.