iPhone reset and delete contents
I reset my iPhone to the factory settings, because I’m selling it. How do I know that all my contents are deleted?
I reset my iPhone to the factory settings, because I’m selling it. How do I know that all my contents are deleted?
You should see the Hello screen when you turn on the iPhone, and the device should no longer appear in your Find My menu.
Hopefully you did all these things.
What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support
iPhone reset and delete contents