iPhone 5 vs iPhone 4S
iPhone 5 - 7.6mm thick, metal casing, non-removable battery
iPhone 4S - 9.3mm thick, glass front and back, metal slides, non-removable battery
The iPhone 5 takes the phone range in a slightly different direction, in terms of looks. It's not any wider than the 4S, but it is longer, letting Apple pack in a larger screen without dramatically changing the ergonomics of the device. Apple's new approach also lets the iPhone 5 get a little thinner - 7.6mm instead of 9.3mm.