does anyone know where i can trade an at&t iphone for a sprint iphone? my sprint iphone was stolen, so my friend gave me her at&t iphone 4 when she upgraded to the 5. i have had no luck so far...the phone is in really good condition and i have the box... craigslist sucks. i've had two prospective buyers that i had been in correspondence with for a couple of weeks. when it came time to set a date&time to meet, they bailed. is there somewhere that will trade with me??