
Google has begun allowing select devices from other OEMs to install their Phone dialer app from the Play Store, the latest service they have slowly started opening up.
At this point the release cadence for new smart services that Google develops seems pretty clear – they announce and typically launch their new Assistant feature, or AI algorithm, or other new data-driven application on their own line of Pixel smartphones, before eventually, and slowly rolling it out to the rest of the Android ecosystem.
Now Google's previously exclusive Phone (dialer) app, though without Pixel features like call screening, live transcription, and other Googley additions, has joined the latter half of that trend as some non-Google smartphone owners are now finding they are able to install the app to their devices too.

The app does seem to need to be approved per-brand and product by Google, while also requiring the ‘Android Dialer Support' shared library to be included in smartphones; a library missing on some phones like Samsung's Galaxy S20.
If you would like to try out Google's dialer yourself then feel free to see if your device is compatible here.