21 things you didn´t know your Iphone could do. NR 19

Tap the home button twice to move app icons and other content toward the bottom of the screen (iPhone 6 Plus only)

If you're using the iPhone 6 or iPhone 6 Plus with one hand, you can double tap the home button to schootch content down toward the bottom of the screen. 

Apple calls this "Reachability Mode." Remember to tap the home button, don't press it or else it'll launch the app switcher.