I currently have an iPhone 6 (64gb), and normally upgrade every two years. The total cost of the purchase every two years is about $790. With the new upgrade program, the yearly cost would be about $440 ($880 every two years). This seems like a great deal, if I'd want a new phone every year. If I entered this program, do I have to turn in my iPhone 6 to Apple, or can I resell it on my own? Also, the monthly fee doesn't seem to include sales tax, is that fee adjusted to include it? If I decide not to upgrade to the next model, I assume I have to stay in the program for the full 24 months to pay off the current model phone, or can I just pay the difference right away? Since this is a loan, basically, is there hidden interest somewhere? Any answers would be greatly appreciated. Thanks.