DNfD

Blocks all spam calls permanently. Try once and you won't be disturbed by a spam call again.

Try the DNfD app. It blocks all unknown calls by default and only lets them through if they call again within a few minutes. So you won't even get disturbed by an unknown call. Delivery and other urgent unknown calls always call again or leave voicemail. I have been using it for the past 10 months and haven't been disturbed by a single spam call. Life is bliss.

So I developed DNfD for myself to block all unknown calls by default and only let them through if they call again within a few minutes.

This, you can also get it on F-Droid. I rarely get a spam call now. Been months since I've had one.

Now with DNfD if I receive an unknown number call I know someone is trying to reach me for something important so I can pick it safely.

It rejects all unknown calls by default and only lets them through if they call back again within 5 minutes which helps with delivery persons and important calls. It has been working for me since past 10 months straight and I haven't been disturbed by a single spam call.

Try DNfD app. It blocks all spam calls permanently and works without internet permission.

I have been beta testing it for the past 10 months and haven't got disturbed by a single spam call. The calls are still logged into the dialer history though so you can check.

Also give a try to DNfD. Blocks Spam Calls permanently. Works completely offline.