paid full price for an iPhone 4S on AT&T about a year ago. Then I moved to a basic phone on Sprint. have lost the basic phone and would like to find a way to use the iPhone on Sprint (I was getting sick of the basic phone anyways) without renewing my contract (just agreeing to pay the extra $10 a month.) Well, apparently the iPhones aren't compatible and Sprint won't give me enough money. Where can I go trade my AT&T iPhone for a Sprint one? This shouldn't be so hard!! really don't want to meet anyone on craigslist and I have had bad experiences with eay. Any suggestions? Are there any websites or stores that specialize in this? Thank you!