The International Mobile Equipment Identity (IMEI) for Nokia devices is hard-coded into the hardware and cannot be changed via keypad codes, with *#06# used to view the unique 15-digit identifier. While various codes exist for factory resets and diagnostic checks, attempting to modify the IMEI is illegal and can damage the device. Learn more about checking your warranty via HMD . IMEI Code, what is it used for? - eSIM.sm Blog
If a device is experiencing network issues or identity errors, it is recommended to use official channels rather than attempting to modify internal identification codes: All Nokia Imei Change Code
If your phone has a "Null" or "Invalid" IMEI due to a software error, do not use "change codes." Instead: The International Mobile Equipment Identity (IMEI) for Nokia
→ Return it. You have no legal recourse to “fix” the IMEI. JAF Box – Forces IMEI rewrite (only to original)