I have seen in some of the iPhone 6 threads that some people have purchased an iPhone 6 + at an Apple Store for retail price and were later able to get it converted to the NEXT plan. Is this a YMMV thing or is it relatively painless to do.
I was just going to do this too and called both AT&T and Apple, and the AT&T store said I needed to do it at the Apple Store (who is happy and willing to do the conversion within 14d)