In case anyone still had doubts about the appearance of an iPhone with a four-inch screen, the video that heads this post shows us an interesting cComparison between the front of the iPhone 4S and that of the supposed iPhone 5 that we have seen over the last few weeks.
The differences are obvious. The screen grows in height while the width is maintained, which forces the upper and lower frame to be slightly reduced. This allows you to increase the size of the screen by slightly increasing the height of the device.
Comparison of the front of the iPhone 4S vs iPhone 5
Another interesting detail is that the front of the iPhone 5 is slightly thinner (0,1 millimeter) and has greater resistance to scratches. Finally, the hole for the Home button also reduces its diameter on the panel of the iPhone 5 (0,3 millimeters).
More information - Sharp affirms that it will be the screen supplier for the iPhone 5
Source - MacRumors