To deal with concerns that a bigger phone will make typing with one hand difficult (the current iPhone has a 4-inch screen), some changes to the design of the iPhones’ software interface will allow people to type or use apps with just one hand — there will be a one-handed mode that can be switched on and off, two employees said.
I guess that's how Apple will justify the increase in screen size on the next iPhone(s), after being opposed to larger screens for years due to the argument that single-handed use wasn't worth sacrificing in favor of a bigger screen on a phone.
