The iPhone 5 is Apple’s thinnest smartphone yet, with its width trimmed down by 18 percent to 7.6mm, 20 percent lighter than its predecessor at 112 grams, and larger with a 4in screen over the iPhone 4s’ 3.5in display. The larger screen size enabled Apple to add a fifth row of icons to the 1136 x 640, 16:9 aspect ratio "retina" display.