I'm planning to upgrade to the iPhone 5S soon along with switching to AT&T from Sprint. Is there any reason I shouldn't upgrade to iOS 7 on my 4S now? I'm going to be selling this phone once I switch. Would having iOS 6 help with resale values or anything like that? I'd love to use iOS 7 and although I'm not sure when I'm going to switch, if it'll help net me an extra $20 or so I may be willing to wait. I'm just thinking of the whole AppleTV 2 vs 3 and jailbreak thing.