Volume বাটনের গোপন সেটিং কেউ জানেনা। Volume Keys Secret Tips Oops! application locker does not use any on screen password ie. pin based or a pattern based locking system. We use volume key pattern as the password. You can make any pattern using volume keys, like UP UP DOWN UP. - Oops Applock is Totally invisible. - Oops Applock ScreenLock is most safest screenlock. - Using Oops Applock ScreenLock nobody can unlock your phone. App Download link - https://play.google.com/store/apps/details?id=com.keybotivated.applock