I've had the 4s on sprint since November 16th. Recently I haven't been able to receive calls when the top left corner says extended, and sometimes when it sprint o, I can't receive calls. I contacted sprint and after resetting the phone a couple times, they had me call apple to get a replacement phone. What I'm wanting to know would my replacement phone come with ios 5 or ios 5.01 or newer. I'm hoping it will be ios 5.