The iPhone 4S is indistinguishable from its predecessor. For the most part, that's fine with me. Having lived through the thin phone craze started by the Motorola Razr, I'm not aching for a slimmer device. Granted, the 4S can feel bulky at times, but I continue to enjoy its solid feel in the hand (something that's not always there with skinny phones). I don't have any problems with the handset's general aesthetics, either. A thinner phone may be prettier, but it's what's inside that really counts.
The 4S inherits all the standard iPhone features from the preceding models, including the calendar, voice memos, weather and stock apps, the various clock features, Google Maps, the compass, text messaging and e-mail, and the Notes app. The iPod player is there as well; the 4S splits your music and video libraries into two separate icons. In another change, the 4S also offers an upgrade to Bluetooth 4.0. Though still a growing technology, Bluetooth 4.0 uses less power and will enable the iPhone to talk to small battery-operated devices like Nike+ sensors and fitness machines at the gym.