I was trying to install a VPN on my phone and somehow I added a screen lock. I cannot turn it off now. When I go to lock screen, select screen lock, enter my pin and next it takes me to the screen select screen lock. I should be able to tap on 'None' to deactivate the screen lock, but its greyed out and I can't tap it. Any ideas, its driving me crazy. I'm using a Lg Optimus l5 (lg-e612).