: *#7780# – Resets settings but keeps user data.
$$*#0000#$$
However, these codes might not work on your device, and changing the IMEI code can be complex.
The following information is provided for educational and informational purposes only. Changing the IMEI of a phone is illegal in most jurisdictions (including the EU, UK, USA, and India) unless you are the manufacturer or a certified operator performing a repair on a legally owned device with a faulty IMEI. Tampering with IMEI numbers to hide a stolen phone or bypass network blocks is a criminal offense.
: *#06# – Displays your unique 15-digit serial number.