In Contacts, you will notice a Duo video call icon has also appeared, while in Android Messages app, you can start a call straight from your chat.
Now, we have v20 of Duo hitting stock Android devices and a teardown brings an interesting finding to the fore. With ViLTE (Video Over LTE), users can immediately switch to Video call even while in between a normal voice call.
This means consumers can now make video calls directly from the phone, messages, and contacts.
Google clears that users will have to run the latest versions of the Phone (v13.0), Contacts (v2.1), and Android Messages (v2.6) app to support the feature. Starting today, on certain Android handsets, a trio of apps will allow users to make video calls using Duo. Charlston's comments would indicate so, but knowing Google's history of shipping devices, it's not a certainty; perhaps call ahead if you're thinking about making a trip. If the carrier or phone does not support ViLTE, the calls will be routed via Duo App itself.