An IMEI is a unique 15 to 17 digit identification number that distinguishes your mobile device, its components and capabilities. The IMEI can give you access to loads of useful information including:
Additionally, in the event that the device gets lost or stolen, the IMEI can be used to file a report which will rend the device unusable on most networks even if the SIM has been changed.
You hope you never need it, but it’s there if you do.
1. Enter *#06# on your phone’s dial pad.
2. Check in the settings:
Android: Go to Settings > About device > Status
iPhone: Go to Settings > General > About
Windows Phone: Go to Settings > About > More info
3. Find a sticker (often silver) on your phone or in the box it came in