Call Screen is a feature that was originally exclusive to the Pixel 3 and Pixel 3 XL, but Google eventually brought it to the Pixel 2 and Pixel models as well. Now it looks like Call Screen could soon expand to non-Google phones.
Code found within Google's Phone app suggests that Call Screen will soon be offered on Motorola and Nokia devices. Reddit user hkyq found the following flags in the app that are pretty straightforward:
<boolean name="__data_rollout__SpeakEasy.CallScreenEnglishUsForNokia__launched__" value="false" />
<boolean name="__data_rollout__SpeakEasy.CallScreenEnglishUsForMoto__launched__" value="false" />
You can clearly see the name Call Screen and the name Nokia and Moto, and the flags also mention the name "Speak Easy", which is the codename for the Call Screen feature. Unfortunately, the flags don't offer any info as to when Call Screen might actually launch on Nokia and Motorola phones or exactly which models will get it, but the Android One phones from both companies seem like safe bets to get Call Screen.
Call Screen will let you use the Google Assistant to screen an incoming call, meaning you don't have to talk to scammers or robocalls. The person on the other end will be asked to say why they're calling, and you can then select a response like "Tell me more" or "Is it urgent?", and you've also got the option to hang up or answer the call yourself from there. It's a nifty little feature to help you avoid wasting your time with scammers, and it's cool to see that Google may soon bring it to some non-Google phones.