On: 2400 phone providers may be shut down by the FCC f...

[razakel]

>It can't be a hardware specific feature.

It is.

[tantalor → razakel]

Yes & no.

Automatic screening is exclusive to Pixel devices:

https://support.google.com/phoneapp/answer/9118387?hl=en

But I doubt there is any Pixel-only hardware involved.