NOTE: You must execute the "Screen Block" configuration app at least ONCE before using it during phone calls. The Android system security will not allow the app to function if you do not do this.
If your phone's proximity sensor doesn't work, you may have noticed that you are accidentally hitting buttons during phone calls. This app will place a slider bar over the screen during calls to prevent you from accidentally hitting "Mute", "End Call", or any other buttons.
If you need to get to the keypad, you can simply slide the bar to the right and Screen Block will go away. To get screen blocker back, simply select it from the notification bar.
NOTE: The app "Screen Block" must be run after installation to allow the app to run automatically during phone calls.