Jim Dalrymple:

What was important to me for an updated iPhone was the larger screen. However, making a larger screen does come with its drawbacks if it’s not done right. Specifically, if you can’t operate it with one hand, it might be a difficult sell for a lot of people.

I’m happy to report that I was able to operate the iPhone 5 with ease using one hand. That means I was able to reach the top of the screen with my thumb, change options and navigate through the screens without having to reach uncomfortably.

Regarding the iPhone 5 and One-Handed Use