If you are a hobbyist looking to explore the software side of vintage Nokias, focus on (SIM unlocking) rather than modifying the IMEI, as unlocking is legal in many jurisdictions and far safer for the device.
The IMEI is hard-coded into the phone’s EEPROM (Electrically Erasable Programmable Read-Only Memory) and is printed on a sticker under the battery. Carriers use it to blacklist stolen phones, preventing them from connecting to any network. nokia 1200 imei change code
: Clears the LCD display and removes operator logos. 12345 : The default Security Code for Nokia devices. Important Considerations If you are a hobbyist looking to explore