[eisa01]

I will definitely try it just to be sure, but even the move from 3.5" to 4" started to stretch it when reaching for the top left corner of the screen for me.

And then there's this ad from the original iPhone 5 release: https://www.youtube.com/watch?v=EY4c2mh15Yk

No iPhone 6 option at 4" is in direct contradiction to what they said before. It's a reason the Apple Watch is released in two different faces, people are different!

[qubitcoder]

Agreed that it’s rather awkward to tap the top left corner—unless you have large hands. Fortunately, more apps are now supporting the ‘swipe from left edge’ gesture to go back (e.g. Safari).

[baddox]

It's funny that they clearly demonstrate that you can't reach the top right corner of the phone with your thumb.