If you search online forums or watch YouTube tutorials from the late 2000s, you will likely encounter strings of characters presented as "Nokia 1200 IMEI change codes." The most famous of these is the "Nokia War Code" or the generic sequence:
If you need your IMEI for legitimate reasons, such as unblocking a found device with your carrier, use these methods: nokia 1200 imei change code
If your Nokia 1200 has a valid IMEI displayed via *#06# , leave it alone. If it's network-locked, pursue legal unlocking. If it's lost/stolen/blocked, contact authorities – no code will fix that. If you search online forums or watch YouTube
: Using unofficial software to force an IMEI change can "brick" the device or cause an " invalid IMEI " error that requires a professional service center to fix. Nokia 216 IMEI Change Guide : Using unofficial software to force an IMEI