I feel like the "how people hold the phone" study is sort of flawed - people probably hold it in each of these positions at different times. One-handed: clicki

I feel like the "how people hold the phone" study is sort of flawed - people probably hold it in each of these positions at different times. One-handed: clicking audio controls, scrolling through news or similar content One hand holding, one hand tapping: more precise input of things like phone numbers, browsing web pages, etc. Two hands holding: typing long messages, some games. Maybe it's because I have a larger phone (5.5"), but I wouldn't do any input task more than a single button press or scroll using my thumb. I always bust out the other hand for that.