Can you tell me how do you reach the "M" or Delete key in say iMessage while you hold it with left hand in portrait mode?
with your left thumb, presumably. I'm right-handed though so I would be holding with my right hand. But similarly, I can reach the Z or shift key with my thumb.
My wife on the other hand (pun for lols) would probably not be able to and she would be a perfect candidate for a "new" smaller iPhone.