Do cases designed for iPhone 4 fit on iPhone 4S?
While most cases do fit, not all will work perfectly, largely depending on how tightly fit the cases are to the phone. iPhone 4S retain almost exactly the same dimension as the previous iPhone 4. However, there are slight change in locations of some components, most notably the location of the buttons on the side and the proximity sensor, all of which differ from previous model by a few millimetres.