Not sure if this is old news or not, but I just discovered you can register your fingerprint by swiping upwards instead of downwards like it instructs you. I have always been annoyed with how difficult the sensor unlock was, especially with a case that has a lip on the bottom of the screen. Well I decided to try it the reverse way and I found it works much better. I hit the home button with my right thumb and then swipe up and it works I'd say 9/10 times on the first try as opposed to about 6/10 times the other way. Maybe everybody knew this already but I've never seen it mentioned so hopefully it helps someone!