International Mobile Subscriber Identity (IMSI) is a unique number, typically using fifteen digits, and is associated with the Global System for Mobile Communications (GSM) and to the Universal Mobile Telecommunications System (UMTS) ) Internet telephony users. TIMSI is a unique number that identifies GSM subscribers. Say no to plagiarism. Get a tailor-made essay on "Why Violent Video Games Shouldn't Be Banned"? Get an original essay. The issue is made up of 2 separate parts. The leading part consists of six digits in the North American standard and five digits in the European standard. The second part allows the network operator to uniquely identify the user. The IMSI stores the user identity module (USIM) located within the phone and is sent through the phone to the appropriate network. IMSI is used to obtain mobile device details in the Home Location Register (HLR) or Visitor Location Register (VLR). When the phone is paired, the temporary IMSI is allocated and used to identify users in future exchanges. This is embedded in the SIM of your mobile device and is provided when you access networks. It is transmitted during initialization. To prevent the user from being identified and tracked by people eavesdropping on a radio interface, the IMSI is transmitted briefly. To randomly generate, the Temporary Mobile Subscriber Identity (TMSI) is sent in place of the IMSI to ensure that the mobile user's identity remains confidential and eliminates the need to transmit it wirelessly over the radio link in an unencrypted manner. The IMSI is stored as a 64-bit field on the phone's SIM card. IMSI is associated with mobile networks interconnected with other networks, particularly CDMA, GSM and EVDO networks. This number is provided directly on your phone or R-UIM card. The three components of the IMSI are the mobile country code, the mobile network code and the mobile subscriber identification number. The IMSI mobile country code has a similar meaning and format to the location area identifier. The mobile web code has the same format and meaning as the location area identifier and is assigned by governments. Mobile subscriber identification number Identifies the mobile subscriber and is assigned by the operator. Please note: this is just an example. Get a customized paper from our expert writers now. Get a custom essay When the mobile station is powered on, it performs a location update procedure indicating its IMSI to the network. The first location update process is called the IMSI attachment process. The mobile station also performs a location update to indicate your current location when you move to a new location area. The location update message is sent to the new VLR, providing the location information to the subscriber's HLR. Updated regularly regularly. If the mobile station is not registered after the update period, the mobile station's registration will not be unregistered. The IMSI detach procedure informs the network that the mobile station is no longer connected when the mobile station is idle.