I tried to run an app called "Flip4Silence", but it doesn't seem to work on my phone. I have a Prestigio PAP 4055 DUO, running on Android 4.1. Can someone explain what may be causing the problem? I tried several apps, which also should silence the phone when it lays on its screen, but they all fail to run on my phone. 
Any ideas?
Any ideas?
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