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The first, technically known as the Hand ID, is easily the weirdest of the two. When you hold your hand over the Z camera to record your palm, the phone actually identifies you according to the pattern of veins in your hand. Pretty macabre, no? It's a pity, though, that the hand's identity is actually a huge pain to use properly. The problem is that it's almost impossible to have the hand lined up just right the first time – too often, you have to hold the palm of your hand over the phone, be told to bring it closer, do it and start over again. It is possible that people improve over time, but frankly, trying to use Hand ID has left me so frustrated that I prefer to just pick up the phone every time.
Fortunately, these AirMotion gestures are a little easier to live with. Here's how it works: to attract the attention of the phone, you have to make some kind of claw with your hand in front of the camera. (I'm really serious.) From there, you can activate the application shortcuts that you have already configured, play and pause your media files and even reject incoming calls from a simple scan. Let's be clear: the camera can hardly really see the trigger hand-claw properly, and some gestures, like turning your hand to control the volume of the phone, are more fanciful than practical. Nevertheless, these gestural commands really work and are surprisingly practical even during my limited time of intervention.
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