Google has finally enabled a dedicated 'Video call' option in its Phone app. The option in question shows up while you make a normal call, and tapping on it launches the Duo app, switching you to a video call. In case you aren't aware, this integration between Phone and Duo was already there, but the option to access it was missing. That changes now, as the 'Video call' option is now live. Tapping this new option during an ongoing call launches the caller's video camera. On the receiver's end, Duo is launched as well (provided their device is unlocked). Of course, triggering this...
Source: https://www.gsmarena.com/google_phone_app_gets_dedicated_video_call_option_that_launches_duo_from_ongoing_call-news-28677.php
