trade in
How do I prepare my old iPHone for mailing back to apple for trade in
iPhone 12, iOS 15
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If you are using the Apple Trade-in program as part of purchasing a new iPhone, Apple pretty much provides you with all of the steps needed to prepare your old phone.
But, just so you can get an idea on what that is all about, I suggest you take a look at the following support article which goes over it in more detail:
