IMSI (International Mobile Subscriber Identity) Number.
Within the memory of the SIM card is the mobile number, which is held in the form of the
International Mobile Subscriber Identity (IMSI) - a number consisting of up to 15 digits. The
IMSI number is different to the dial up number of the mobile phone, and the mobile phone network translates between the dial up mobile phone number and the
IMSI.
The
IMSI uniquely identifies the mobile phone owner on any GSM network in the world, so is very important for international roaming.
The
IMSI is constructed from the
Mobile Carrier Code (MCC), the
Mobile Network Code (MNC) and the
Mobile Subscriber Identification Number (MSIN) which is itself, a composite of the
HLR and the Mobile Number. The layout of the
IMSI digits are as follows:
| MCC | MNC |
HLR + Mobile Number |
Glossary.
Mobile Carrier Code (MCC) - A 3 digit number that identifies the country in which a mobile carrier is operating. The initial 3 digits of the
International Mobile Subscriber ID (IMSI) number.
Mobile Network Code (MNC)
Mobile Subscriber Identification Number (MSIN) - A composite of the
HLR and the Mobile Number.
If this page was useful, you may also want to read:
IMEI Number - International Mobile Equipment Identity Number
SIM Cards
Smartcards