Flick; Rotate - Samsung Galaxy S4 User Manual

Flick

Flicking the screen is similar to swiping, except that you need to swipe your finger in light, quick
strokes. This finger gesture is always in a vertical direction, such as when flicking the contacts
or message list.

Rotate

For most screens, you can automatically change the screen orientation from portrait to
landscape by turning the phone sideways. When entering text, you can turn the phone sideways
to bring up a bigger keyboard.
Phone Basics 15