The iPhone 4s is the best mobile phone I have ever used. The touch sensitivity is the best of any phone on the market and Apple has the best 3rd party app ecosystem. Apps generally feel finished and refined. The camera, display, and industrial design continue to be the best in the industry in my opinion. The battery life in the 4s is known not to be as good as previous iPhones and I would have to agree. I am on AT&T and the call quality is not that great, but I hardly use it as a phone anyways. The data speeds are much faster on this version compared to previous iPhones and the current 4s on Sprint and Verizon thanks to AT&Ts speedier network over 3g. Overall, this should be at the top of anyones buying guide even compared to the Galaxy Nexus with a less than adequate app ecosystem.