Enable One-Handed Mode on Galaxy S5
If the superb Galaxy S5's 5.1-inch screen is too big for you to work with one hand, you can easily enable the one-handed mode on Galaxy S5 and shrink ...
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Smart Stay is a new feature introduced by Samsung and is first used on its new smartphones, like Galaxy S III. It is now available for some other Samsung smart phones too. If this feature is On, then the device’s screen stays on as far as the user’s eye is looking at the screen. This is very useful when reading something on your device. Since the app is using device’s second camera, if the camera is busy with other application or around you is too dark to identify your face, the feature is not working as expected
To active the Smart Stay, go to Setting > Screen and then enable Smart Stay