Refurbished
How can I check if any part have been replaced in my iPhone?
Question marked as
There's really no place to check. Where did you buy this phone? Was it sold as refurbished? Refurbished by name means part were replaced in the phone. If you bought a refurbished phone from Apple directly, any parts replaced would be genuine Apple parts. If you bought the phone from someone else, there's no telling where parts may have come from. But only Apple can replace parts with Apple parts.