I I had to replace my old iPhone 5 yesterday. This new one is on iOS 7.1 I am now getting lte in most areas that the old phone never got that said my old phone would get 4g very where. And like last week I finally got it in my area. I was in edge but tmobile must have updated cause 3 weeks ago my area started getting 4g. Old phone was a iPhone 5 on iOS 6.1.2 u think. Now with the new phone I am back on edge but my wife is still getting 4g. So I got some good and some bad with the new phone