AT&T Next Plan and Pre-ordering a new iPhone 6s Plus
So last year I changed to the AT&T Next Plan where I can upgrade after 12 payments. I'm eligible. Now, my question is that: Do I have to march my fat arse to the store and physically order the new iPhone 6s Plus on launch day because I have to trade in my existing iPhone OR can I pre-order it online and ship the existing iPhone back to them to satisfy my contract?
AT&T's FAQ does not answer this question. I'd love to be able to just do the pre-order this Saturday, have it arrive on launch day, and ship my existing iPhone back to them. Anyone have experience with AT&T Next?
Current: Space Grey iPhone 6 Plus 128GB
Future: Space Grey iPhone 6s Plus 128GB