While it wasn't quite the redesigned iPhone 5 we'd so often heard rumors about, the iPhone 4S continued to do what iPhones before it have done best: sell. The processor got even nimbler, the camera is one of the best on any phone out there, and Siri, the intelligent voice assistant, has legions of iPhone owners regularly conversing with their handsets. The iPhone 4S found its way to Sprint's network too, further expanding Apple's mobile footprint.