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Reset old phone after activating on another phone
iPhone 12, iOS 17
See the following Apple Support article for information on what to do to an old iPhone before selling, trading or giving away: What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support
See the following Apple Support article for information on what to do to an old iPhone before selling, trading or giving away: What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support
If I understand your very short post, you want to completely erase and reset your old iPhone so you can re-home it. Please see Apple's advice in
What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support
reset
