how to find serial number of an iPhone6 from its IMEI
I've used an outside site to get my IMEI, and another site to find the serial number of an old iPhone6 that I no longer own. Question, do IMEIs and/or serial numbers change when batteries are replaced? or when the phone is repaired? The serial number I have been given has not been accepted as valid on yet another third-party site. any help?
Earlier iPhone models