Trade-in: When must an old phone be handed over?

If you do it at an Apple Store, immediately. Doing it later will get you credit, but it can't be applied to a previous purchase.

If you do it with Apple online, it's best if they get your old unit within 14 days.

If you do it at a different store, ask their staff.

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Depends on how you do the trade'in exactly.

If you trade it in during the purchase of a new iPhone at a physical Apple Store, you will need to hand it over at that moment.

If you purchase the new iPhone online, you will get a shipping box to send it back in and have 14 days to complete the trade in.

You can find more details about the process in Apple's Trade-In website. click here ➜ Apple Trade In - Apple