Reset vs erase all content and settings
Will my new iphone 14 information get erased if I erase all content and settings from my iphone SE after the transfer is completed to the iphone 14?
iPhone SE (Gen 3)
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No. Also note that you can do all of the steps in the following support article on the old phone without affecting the new one: What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support