Although the new model is 18 percent thinner and 20 percent lighter than the iPhone 4S, the metal-backed iPhone 5 has a taller screen than its predecessor. The 4-inch "retina" display on the iPhone 5 includes
326 pixels per inch, according to CNET. With a total pixel count of 1,136x640 and an aspect ratio of 16:9, the screen provides space for a fifth row of icons.