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 told by a very knowledgeable rep (I was bombarding him with questions and he was awesome) that this is something they can do. I am not sure, however, how they give the money for the phone back to you. Whether it is a check or provided in the form of bill credit, etc.
Yes. I did this when I received my preorder. You will need to do the in-store return/refund/repurchase from where you purchased the phone (i.e. preorder apple = refund/repurchase at apple). It was straightforward for the two phones I moved over to NEXT because they were not yet opened (which I was told by Apple made a difference)… but who knows. Needs to be within the 14 BRE (buyers remorse exchange) return period. Please note that only device changes can be made at an Apple store. They will not be able to convert you from a legacy plan to a new Mobile Share plan.