Does the Apple trade in kit come together with the new device?

Like babowa wrote, it comes separately. You have 14 days to return the old iPhone or cancel the trade-in, so if you were hoping to transfer your data first, you'll be able to.

Either way, you still pay for the iPhone in full- it's either part of it is paid for by the phone you send in, or they charge you the extra money if you don't send it in.

it comes separate and you use the box for the trade in return. The shipping label is underneath the address label - peel

that off carefully.