By Todd Bernhard on Tue, 01/27/2015
Apple took its time releasing a phablet and there were several reasons for that delay. Steve Jobs felt that larger phones were unusable, and that users would appreciate being able to operate the iPhone with one hand. Tim Cook is in charge now and Apple figured out how to control basic functions with one hand using Reachability. This mode is activated by double tapping (not double clicking) the home button, and it can be disabled or enabled in Settings > General > Accessibility. With this mode enabled, apps and menus can be made to display in the lower half or two thirds of the screen, so everything is in reach of your thumb even if you're holding the iPhone in one hand.