★★★★★ Addictive tips, lifehacker reviews the app as unique. "Hilariously brilliant and effective." - Android Authority. ★★★★★ 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. - Using Oops Applock ScreenLock nobody even notice phone is locked. - Oops Applock ScreenLock has different styles to choose. - Oops Applock is Most secure way to lock apps. - Nobody even notice your app is locked with Oops Applock. - Oops Applock is Simple. - Oops Applock is Fun to use. - Oops Applock can lock any applications. - You can set different background for lock screen on every locked App with Oops Applock. - Transparent and Black background makes as if your application is stuck. - Fool friends with custom backgrounds using Oops Applock. Tip- While choosing custom background, make sure it matches with your screen size to avoid clarity of the image. Detailed How to by wonder how to http://nexus5.wonderhowto.com/how-to/protect-apps-with-secret-volume-button-code-android-0158406/ App discussion forum, http://forum.xda-developers.com/android/apps-games/app-oops-applocker-applocker-pin-t2960898 Please report bug at xda forum, so i can keep in touch with you. Help me Translate to other languages https://keybotivated.oneskyapp.com/collaboration/project?id=55522 Oops AppLock uses the Device Administrator permission. Please activate AppLock as "device administrator". It's only used for preventing intruders uninstalling Oops AppLock. Happy Locking.