iPhone 12 Pro Max trade in
I purchased a new iPhone but didn’t select trade in old iPhone at the time now I want to trade in my old iPhone and my 14 days is not up
iPhone 12 Pro Max, iOS 14
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I purchased a new iPhone but didn’t select trade in old iPhone at the time now I want to trade in my old iPhone and my 14 days is not up
iPhone 12 Pro Max, iOS 14
I think you can just bring the trade in to an Apple Store..
I recently traded in an iPad Mini 5 about 2 weeks after my new iPad Mini came and they were able to go back and adjust the transaction, I opted to get the balance on a gift card.. but I believe they also would have credited the payment method.
Doing it this way helped the 'trade in value' because I believe it offset the total taxes owed, so my gift card was the trade in value + how much less the taxes would have been if I had traded it in on the same transaction as the new iPad purchase.
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
I think you can just bring the trade in to an Apple Store..
I recently traded in an iPad Mini 5 about 2 weeks after my new iPad Mini came and they were able to go back and adjust the transaction, I opted to get the balance on a gift card.. but I believe they also would have credited the payment method.
Doing it this way helped the 'trade in value' because I believe it offset the total taxes owed, so my gift card was the trade in value + how much less the taxes would have been if I had traded it in on the same transaction as the new iPad purchase.
What to do before you sell, give away, or trade in your iPhone, iPad, or iPod touch - Apple Support
Like Chris said, you can trade it after the purchase. 
iPhone 12 Pro Max trade in