Glossary:International Mobile Subscriber Identity (IMSI) English (en) français (fr)

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The International Mobile Subscriber Identity, abbreviated as IMSI, is the internationally standardised unique number to identify a mobile subscriber, as defined in ITU-T Recommendation E.212.

The IMSI consists of:

  • a Mobile Country Code (MCC) identifying the country;
  • a Mobile Network Code (MNC) identifying the mobile network operator (MNO);
  • a Mobile Station Identification Number (MSIN) identifying a device (via the SIM card).

When dealing with devices in a single country, the MCC can be dropped out and the combination of the MNC and the MSIN, which is a 9-digit code identifying the subscriber, is usually referred to as the National Mobile Subscriber Identity (NMSI).

As long as a subscriber has not changed his SIM card, the IMSI will remain the same even when switching mobile device.