What should I expect to get for an iPhone 5s in good to great condition from AT&T or Apple after release of the new phones? I'll be buying new phones this fall. I figured we'd trade in our phones with AT&T -- they had better price than Apple and Gazelle was a good bit lower. But my wife is considering gifting them to our teenage nieces. We need to estimate the phones' trade in value to figure how it fits in our gifts budget for them.