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IMSI, MSISDN, IMEI, P-TMSI - Mobile Identifiers - Mobile Packet Core
The MS is having several identifiers that is used while communicating with the network, those identifiers are the IMSI, MSISDN, IMEI, P-TMSI. In case there is an MS that is having Dual SIM, every SIM is having its own IMSI, MSISDN, IMEI, and P-TMSI.
Mohamed Salem