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International mobile subscriber identity
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International mobile subscriber identity : ウィキペディア英語版
International mobile subscriber identity
The International Mobile Subscriber Identity or IMSI is used to identify the user of a cellular network and is a unique identification associated with all cellular networks. It is stored as a field and is sent by the phone to the network. It is also used for acquiring other details of the mobile in the home location register (HLR) or as locally copied in the visitor location register. To prevent eavesdroppers identifying and tracking the subscriber on the radio interface, the IMSI is sent as rarely as possible and a randomly generated TMSI is sent instead.
The IMSI is used in ''any'' mobile network that interconnects with other networks. For GSM, UMTS and LTE network, this number is provisioned in the SIM card and for CDMA2000 in the phone directly or in the R-UIM card (the CDMA2000 analogue to a SIM card for GSM).
An IMSI is usually presented as a 15 digit number, but can be shorter. For example MTN South Africa's old IMSIs that are still being used in the market are shown as 14 digits. The first 3 digits are the mobile country code (MCC), which are followed by the mobile network code (MNC), either 2 digits (European standard) or 3 digits (North American standard). The length of the MNC depends on the value of the MCC.〔(3GPP specification 23.003 )〕 The remaining digits are the mobile subscription identification number (MSIN) within the network's customer base.
The IMSI conforms to the ITU E.212 numbering standard.
==Examples of IMSI numeric presentation==



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