With its first size bump in five years, iPhone 5 will add about a half-inch -- exactly 176 pixels -- to its length but nothing to its width. At 7.6 millimeters thick, it will be 18 percent thinner than the 4S. And at 3.95 ounces (112 grams), it's 20 percent lighter than its 4.9-ounce predecessor.
What's significant about this size? For starters, it will allow playback of HD video at native resolution and then some. The new resolution will be 640 x 1,136, compared with iPhone 4S's 640 x 960. The new size offers the ability to display video content in a 16:9 aspect ratio. And like the 4S, the iPhone 5's display also is a Retina, and its pixel density is the same 326 ppi. The extra pixels also will afford more space for apps and an extra row of icons. Also included will be iOS 6.0 and new versions of all pre-installed apps that are aware of the larger screen size. Apple says that apps not updated for the larger screen will run in their old size on iOS 6; they will not be scaled or stretched.