Hi- I was planning to take advantage of the minimum $200 trade-in for iPhone. I had a few questions which I can't find answered anywhere and have received conflicting info from Sprint reps. Do you have to buy the iPhone from Sprint directly to be eligible or can I purchase through Apple? Can I really submit any iPhone? I have an old 3GS hanging around here I'd rather send than my 4s. The offer expires 9/30. If I create the shipping label on 9/30 and don't actually receive the iPhone 6 until mid-October to enable me to return the phone will I still receive the minimum trade? Thanks to anyone who knows!