Aaron reviews the Apple iPhone 4S, the evolutionary upgrade from the iPhone 4 that debuted sixteen months ago.  While the design is virtually identical to its predecessor, there are quite a few improvements in the 4S like a dual-core Apple A5 (800 MHz) processor, 8-megapixel camera with 1080p HD video recording, global roaming capabilities thanks to a SIM card slot in all models, and Apple's iOS 5 out of the box.  It retains the same 3.5-inch Retina display and metal/glass aesthetic.  It's available at AT&T, Sprint, and Verizon starting at $199.99 with contract.

It's a nice revision and packs some awesome features, but the mobile market has shifted dramatically over the past sixteen months, and Android is closing the gap.  Is the 4S enough to lure new customers and keep existing iOS users on the platform?  We'll find out.  Part 1 of 2.