So I got a 6 thinking it was the right size and because that's what was available when I got it, I honestly feel that it's too small for me, I wish I got the 6+ because of the screen and the battery life, so I want to sell my 6 for a 6+, I want to know if I can 600-650 for it so I can pay off the att next plan I got it on and get a 6+ on att next? I also have the smallest little chip by the headphone jack, which I don't know how it happened because I have never dropped my phone before, so can I get 600-650 even with the tiny chip for the 6+ and pay off the att next and just start a new att next with the 6+ because I know I'll keep that for a long time