> But navigating the full screen while holding the iPhone [5] in one hand is worse ... Consider the windshield wipers on a car, and how, because they swing in a

> But navigating the full screen while holding the iPhone [5] in one hand is worse ... Consider the windshield wipers on a car, and how, because they swing in a radial arc, they can’t reach the passenger-side top corner. Gruber brought up a very good point about the somewhat less than perfect screen size which shows a UI weakness of iOS: the back button—one of the most used UI elements—is always at the top left. Try it yourself, go to versus io to see the iPhone 5 in its orignal size, calibrate your screen (click at the top-right corner on versus io) and place your hand next to the iPhone and see if your thumb would be able to reach the top-left corner: http://versusio.com/en/apple-iphone-5-64gb-vs-samsung-galaxy-s3 http://versusio.com/en/apple-iphone-5-64gb-vs-samsung-galaxy... In contrast, Android has hardware back keys always at the bottom, so even 4,8" phones could be used for a short while with one hand (just try the same experiment with the S3). Moreover, there's a huge target not bothering about bigger phones because they have space in their bag and don't put them into their pockets (women). So, I agree with Gruber to start offering two size: 3.5 and something about 4.5 or even larger (and changing the back button UI in the long run).