9To5Mac seems to have some pretty good sources inside Apple because they have quite a lot of detail about two iPhone 5 prototypes that are currently being tested at Apple. Both devices have a 4-inch screen. And as some earlier rumors have stated, the phone will be the same width but will be slightly taller, at 3.484 inches. The new display will have the same number of pixels across, but will add 176 pixels to the height, with a resolution of 640 x 1136 compared to the current 640 x 960.