Ask HN: How to get out of Robocall Hell?

I have an Android phone. I have received 5 robocalls today, the first at 9:33AM, the most recent at 4:28PM. This is ridiculous!

Does anyone know of a solution that does the following: 1) If the calling # is in my contacts, it will ring. 2) If the calling # is not in my contacts, it goes to voicemail (only 1 robocaller in the last 2 years has left a voicemail). I've looked through all of the settings, and none of them provide this simple (seemingly obvious to me) behavior.

The problem is this: I DON'T TRUST MOST OF THE APP STORE APPS! I don't want them uploading my contacts to a server. I don't want them sending my incoming call information to a server. I don't want spyware/adware/crapware.

In the infinite wisdom of the Hacker News masses, surely someone knows of a safe, inexpensive, privacy-preserving solution!?!