Yet Another Call Blocker

Sick and tired of receiving annoying call center calls (mostly creditors...) I've developed this little and simple application to pickup and hangup the calls incoming from anonymous id.
Despite of the foreground service, the application is very lightweight and battery friendly.
The application should completely mute the anonymous incoming call but, due to the OS architecture, it is still possible that a little ring (and/or vibration) is issued before the application comes into action.
Last but not least YACB is free and without any advertising.
That's all.