How To Do Convinient Mobile App

Some interresting raw facts from article How Do Users Really Hold Mobile Devices? by Steven Hoober about using mobile devices.
Most of apps, that I am using on my Android phone does not take into account fact, that red areas exist.

How people hold and interact with mobile phones:


Two methods of holding a touchscreen phone with one hand:


The two methods of cradling a mobile phone:


Two-handed use when holding a phone vertically or horizontally:


Surely there is more interesting and useful information in the article, so I advice to read it as well, not only to look pictures.