Tuesday, August 07, 2007

What an IMSI and PLMN is ?


The IMSI (International Mobile Subscriber Identity) is a unique 15-digit code used to identify an individual user on a GSM network.

The IMSI consists of three components:
  • Mobile Country Code (MCC)
  • Mobile Network Code (MNC)
  • Mobile Subscriber Identity Number (MSIN)
The IMSI is stored in the Subscriber Identity Module (SIM).


Short for Public Land Mobile Network, a generic term for a mobile wireless network that is centrally operated and administrated by an organization and uses land-based radio frequency transmitters or base stations as network hubs. PLMNs can stand alone and interconnect with one another or connect to a fixed system such as the PSTN.

Cellular phones and mobile Internet access are two common uses of a PLMN.

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