iPhone 15 Preorder Thread

I moved over to T-mobile last year and traded in for an iPhone 14 for my wife and I. We received a trade in credit on the Magenta Max plan.

If we were to trade in our iPhone 14 for the 15, is this what would happen if we stay on the Magenta Max plan:

1. We pay off remaining balances for our phones. 
2. We still keep the remaining credits from our 2022 trade in promo for our iPhone 14 phones. 
3. We then trade in our phones for the iPhone 15 and get $1,000 trade in credits.
4. We then have the monthly finance fee - the credits that we got from the iPhone 15 promo and the remaining credit promos from our iPhone 14 trade in last year.

Is that right?

And if we were to go with the Go5G Next plan, is the only difference between the above is:

1. We don’t need to pay off remaining balance (as long as we paid 50% of the phone cost already)
2. We then pay difference in price plan between our old Magenta Max and the new Go5G Next plan.