I bought it used from someone and found out that I can’t use it because the iPhone’s IMEI is blocked by my service provider.
How do I change or edit the IMEI of my blocked iPhone 4?
Technically, there’s no tool or method available to change your IMEI. Once it’s blocked by your service provider, you won’t be able to use it anymore.
However, this service offers chips replacement which will change the IMEI of your iPhone. Potentially it will allow your iPhone 4 to be used on your network of your choice again.
If you have a USA Verizon iPhone with bad ESN, you can clean the ESN here.
Another alternative is to do a logic board swap with another person from another country or use this service.
WARNING: Some scammers have been reported to operate in many websites. Please deal safely or use a third party service here.