The iPhone 4S hardly needs an introduction: it's Apple's latest and greatest (yes greatest) iPhone yet, and it's available on three of the big four carriers. Each carrier uses the same hardware, with only software and firmware differences setting them apart. The iPhone 4S has a dual core Apple A5 CPU that's twice as fast as the iPhone 4, and it's available in three storage capacities. It uses the same 3.5" Retina Display as the iPhone 4, and it has an improved 8 megapixel camera that can shoot 1080p video. It runs the new iOS 5 operating system and it has the remarkable Siri voice-activated personal assistant. Is it the best smartphone money can buy? Read our review to find out.