Add all of your regular calls to contacts. Block any calls not coming from your contacts. See "Should I Answer?" app for example.
this post was submitted on 27 Feb 2026
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Privacy
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The problem is this also blocks SMS from those outside your contacts. It will be an issue with 2FA.
I created a "Do not disturb" profile that only blocks voice calls for non-contacts. SMS still comes through. My ringtone is a silent file, but that's just my preference.
In the DND profile, I only allowed messaging apps to show notifications. I don't care about the rest.
That sounds interesting! Thank you for the info
I have phone screening. It's called "block unknown callers" and it comes in most phone apps. If it's important they'll leave a VM or text.
Is it on GrapheneOS?
The stock Phone app on GrapheneOS has options to block unidentified callers, non-contacts, and/or individual phone numbers
Thank you!
GOS is just the operating system. You can install and use whatever phone app you want.
Does anyone have an actual answer to the question? I have someone I'm trying to convert to Grapheneos but who is also trying to run a business, making a simple "block unknown callers" not very tenable.
GrapheneOS has benefits even when used with Google Play Services. At least on the primary profile, you can install the Phone by Google and get good call spam blocking. Other apps that you'd prefer to be siloed can be put on another profile without play services.
I used to use Carrion, but sadly it is no longer maintained and I haven't found a good replacement yet.
There is an app on fdroid called SpamBlocker that I am using. It allows you to add spam call databases like the US's do not call list, for example. You can also do other stuff like block numbers that don't have a specific area code or that come from a specific state, etc.
I tried that for a couple months but it didn't seem to do really anything useful. Any tips to make it work better?
Thank you very much! Google Android is turning into IOS this sep. How will it effect to Fdroid? I'm disappointed in Google's new policy now.