I just want to give a heads up to people who use launchers such as Nova about the "knock-on" or "knock-knock" feature. That feature is great and without it I would not keep this phone. Reaching around to the back to awaken the phone and put it to sleep would drive me nuts. The only time you really need to use the button on the back is to turn the phone off and on if you are using the knock-on feature. It works great. When I installed Nova launcher I could knock to awaken the phone by knocking twice, but could not to put it back to sleep by knocking. I had to use the button on the back to put it back to sleep. Not using Nova is not a huge deal to me because this phone does not need Nova as much as others I have used. I primarily used it when the Google search bar could not be removed and took up space on every screen. That is not an issue here. Also, the LG UI is very customizable. Perhaps I missed something in the set-up and it can be made to work, but I thought I would post this possible issue.