3.5 Inches (2011)

I looks like users agreed. Ah, wait, no they didn't.

I think that people are happy to make adjustments to how they hold a device, if they think the real estate is worth it.

I hold my Nexus 4 in such a way that single handed usage is no issue at all, as I use it daily while walking or on the tube. It's never been an issue for me.

Prior to that I had a Note, and again the screen size was never an issue. In fact most of the Note users I spot in London are women, who (on average) have even smaller hands, but seem to get by OK with a 5.5inch screen.

Many such gems with HN discussions to prove 3.5 inches was a universal constant [1] Just search..

[1] This Is The Reason Why The iPhone Will Always Have A 3.5-inch Screen

http://www.redmondpie.com/ever-wondered-why-the-iphone-has-a...