Once you enable it you open the camera, you will notice a new icon on the screen a face with little waves. Now if you say shoot or one of the other words it takes a picture when u say the word. It's pretty cool, just don't say shoot on in a airplane. The answer reject calls should work the same way, but I haven't had any luck with the answer or reject yet. Update To answer calls hold the phone face up in your hand and semi close to your face and say answer and it answers the call, same for reject.