Phone ownership
How do I go about changing the ownership of my iPhone 6plus?
iPhone 6 Plus, iOS 12
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What do you mean by “ownership” exactly?
An iPhone can be registered to an Apple ID and that can be changed. But there is no record or registration of ownership as such for an iPhone.
If you are going to be selling or giving away an iPhone, see here to get it ready to be setup and used by the next user: link-> What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support