We think you know this but in case you forgot: IMEI (international mobile equipment identifier) is a number, usually unique, for identifying phones..
This feature speeds up the take-in procedure and the device is set for repairs quicker. Simply enter IMEI in the corresponding field and 'Brand' and 'Model" will fill in automatically.
If you wonder how the function works, it is easy: by means of integration with a service that provides access to a database of serial numbers and IMEI.
Here's how it works: