IMEI is an acronym for International Mobile Equipment Identity. The IMEI number found on most cell phones helps to identify the phone's origin, serial number and model.
The IMEI number is a 14-digit number that is unique to each device. It is often used to identify a particular device on a network, and it gives cell phone carriers the option of blocking a lost or stolen phone.
On most phones, the IMEI number can be found in the battery compartment. Cell phone owners can retrieve the IMEI number by calling #06# if they are unable to remove the phone battery. iPhones owners can find the IMEI number under the Settings section, then by selecting the General and About links.