I created this app in spite of the fact that many other similar call blocking and screening apps exist, but I am unsure of how they work under the hood, and what they do with my personal information.
This application is 100% ad-free, does not require network connectivity, and the source code is fully available for you to confirm your personal privacy. The app full-fills a single purpose in the most minimal of code, and minimal of user interface.
Although this application is open source, and you are completely free to build your own APK from it. I am placing the app into the Play Store at a small cost. If you the consumer would like see more useful applications which are 100% ad-free, affordable, with full source code disclosure, then please do support me as a developer in the Play Store.
Source code: https://bitbucket.org/kveroneau/callscreening