The most noticeable change in the new iPhone is its larger, 4-inch screen. The display actually isn’t any wider than the previous one, but instead extends length-wise to a 16:9 widescreen aspect ratio. Its resolution is 1,136 x 640 pixels — that’s not quite high-def, but it still has the same pixel density — what Apple calls a retina display. The taller screen allows for five rows of apps (plus the permanent row on the bottom), and Apple says its colors are better, too.