Changing the IMEI code on your Nokia 105 (TA-1203) can have risks and consequences:
Reboot the phone and dial *#06# . The correct IMEI should appear. nokia 105 ta 1203 imei change code
Connect the phone turned off. Install the Nokia USB drivers so the device appears as "Nokia USB Phone Parent" in Device Manager. Changing the IMEI code on your Nokia 105