International Mobile Equipment Identifier

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International Mobile Equipment Identifier (used in GSM)

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 device or accessible through menu.

Source:

http://www.aeris.com/iot-dictionary/

References:

https://en.wikipedia.org/wiki/International_Mobile_Equipment_Identity

https://uk.wikipedia.org/wiki/IMEI