Unlock android phones by face detection

This is a cool android trick by which you can unlock your phone by using face detection, In the jelly bean version, android provides a way by which android phone can be unlock using face detection, to make this feature more secure, jelly bean version added another layer of protection in which android phone can be unlocked only when the face is matched as well as we have to blink eyes in order to unlock phone. Blinking eyes tells the android security system that person is live and it’s not an illegal attempt of unlocking using a still image. To activate this, > Go to Settings > Security > Screen lock > Face unlock.