99.9% are scams. They either show a fake video edited to look like the IMEI changed, or they ask you to pay for a code that does nothing. Do not fall for it.
For legitimate network issues, you can use the official Nokia support page to find authorized service centers or use third-party tools like the IMEI.info checker to verify your device's technical details.
While you cannot change your IMEI via a code, you can use built-in system codes to diagnose your device and check its network status. To use these, simply type them directly into the home screen keypad:
Professional service centers use flashing boxes to read/write the phone’s NV-RAM. These tools can rewrite the IMEI partition. Steps (simplified):
Since you cannot type a code to fix the Nokia 108 RM-944, you must use hardware tools. The Nokia 108 utilizes an MTK (MediaTek) chipset, specifically the MT6260A. This requires specific servicing software.