Your original IMEI is printed on the phone's packaging.
If you are a hobbyist, always back up your EFS/NVRAM partition via TWRP or specialized tools before attempting any software changes. Final Thoughts Your original IMEI is printed on the phone's packaging
Many "free" IMEI changers found in .rar files are actually Trojans designed to steal your data. Always scan downloads with updated antivirus software. How to Safely "Repair" (Not Change) Your original IMEI is printed on the phone's packaging
Here is a blog post covering the essentials of IMEI repair and what to watch out for. Your original IMEI is printed on the phone's packaging