8. Use hand gesture to accept a callThe S4 comes with a feature called the Air Call Accept, where you don't even have to touch your device to answer an incoming call; rather, all you need to do is swipe your hand over the infrared sensor that's next to the earpiece speaker, and the phone will read your gesture. This is great when your hands are dirty and you don't want to touch the screen.
To enable this feature: Go to Settings> My Device tab> Movements and gestures> Air gesture.