Google’s Phone (dialer) app was added to more, non-Google devices back in April. As per Android Police, the Phone app is now available to download on more smartphone brands as well. The app works on both Samsung and OnePlus devices as Android Police has pointed out. We can corroborate that it works on the OnePlus 8 Pro. We were able to install it by enrolling to the App’s Beta program through this link on a computer, and then downloading the app via the Play Store (also from desktop). The Phone app isn’t easy to find from the Play Store app, but you can use a direct link...
Source: https://www.gsmarena.com/googles_phone_app_beta_can_be_installed_on_any_phone-news-44707.php