Instead, the subscriber is identified by transmission of an International mobile subscriber identity (IMSI) number, which is stored on a SIM card that can in theory be transferred to any handset. The IMEI is only used for identifying the device and has no permanent or semi-permanent relation to the subscriber. This renders the phone useless on that network and sometimes other networks too, whether or not the phone's subscriber identity module (SIM) is changed. For example, if a mobile phone is stolen, the owner can call their network provider and instruct them to blacklist the phone using its IMEI number. The IMEI number is used by a GSM network to identify valid devices and therefore can be used for stopping a stolen phone from accessing that network. It is usually found printed inside the battery compartment of the phone, but can also be displayed on-screen on most phones by entering *#06# on the dialpad, or alongside other system information in the settings menu on smartphone operating systems. The check digit is the function of the digits prior to it.The International Mobile Equipment Identity or IMEI is a number, usually unique, to identify 3GPP and iDEN mobile phones, as well as some satellite phones. The following six digits define the manufacturer and the last digit (check digit) is calculated using Luhn algorithm. The initial eight digits define the model and origin, and are collectively termed as Type Allocation Code. The digits comprising the IMEI number represent the origin, model, and the serial number of the mobile device. Though law-breakers have originated many ways to change the IMEI number, they rarely opt for this due to rigorous regulatory compliances. The Telecom authorities of many countries have introduced stringent measures to make it mandatory for the manufacturers to produce devices bearing a valid IMEI number. IMEI number is strictly related to the mobile device and has no relation with the user. For this, the owner should call the network service provider and instruct them to stop any further services of the phone. The IMEI number can be used by the owner of the mobile device to blacklist the phone. You can locate the IMEI number of your cell phone either on the box, or printed inside the battery compartment. This 15 digit (14 digits plus a check digit in the last) number is a prominent measure to trim down the instances of using a stolen/lost mobile phone. IMEI (International Mobile Station Equipment Identity) number identifies legitimate devices using the GSM network.
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