An International Mobile Equipment Identity (IMEI) is a unique 15-digit number that identifies a mobile phone. It is used by the network operator to track the device and to prevent it from being used on other networks. The IMEI can also be used to track a lost or stolen phone.
There are several ways to check the IMEI of a mobile phone. One way is to dial *#06# on the phone’s keypad. The IMEI will then be displayed on the screen.