Carriers use the IMEI to identify valid devices trying to access their cellular towers.

Carriers use the IMEI to identify valid devices and block blacklisted or stolen handsets from accessing the network. The Reality of "IMEI Change Codes"

: A Windows utility that provides IMEI repair functionality for certain Nokia devices

Dial *#06# to see if the numbers match the sticker located under your phone's battery. If they match but you have no signal, the issue is likely network compatibility (many regions have shut down the 2G networks required by the X1-01).

The following technical information is provided for educational and research purposes only. It is not an endorsement of any illegal activity. Users are solely responsible for complying with their local laws. The intended use for IMEI repair is strictly to restore a device's own original, legitimate IMEI number after a software corruption error.