International Mobile Subscriber Identity (IMSI) is embedded on SIM card and is used to identify a subscriber. 15 digits normally , Initial 3 digits stand for MCC , next 2 or 3 digits stands for MNC,
last digits stands for MSIN.
MCC--> Mobile Country Code identifies country for mobile networks. The MCC values are allocated and published by the ITU-T.
MNC--> Mobile Network Code identifies mobile network within a mobile country(as identified by MCC). MCC and MNC together identify a PLMN.
MSIN--> Mobile subscriber Identification Number (MSIN) - the MSIN is the subscriber identifier within a PLMN (Public Land Mobile Network).
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