I've turned on everything, no task managers, uninstalled all apps, flat surface and it wont work
me too. it works using the 'try it' function (even when its not lying flat) but not when the screen goes off and i cant see a 'hand' icon.
The sensor is located near the top of the phone, the top left corner from what I can tell. Make sure you're making your swipe through that area and no more that just an inch or two off the phone.
Are you sure you mean Air Gesture or Smart Screen? Smart Screen (to the best of my knowledge) is the one that follows your eye movements. Air Gesture is more hand-motion based.
BTW, God help you if you wear glasses. Smart Screen seems to have no love for the optically-impaired unless they wear contacts!
definitely air-gesture, quick glance
You have to be using the stock samsung apps for the gestures to work. Also make sure not just air gesture is turned on, but if you click on air gesture, it goes to more specific instances of it, and make sure those are turned on.
Separate names with a comma.