The update has brought an updated look to the contact list on Duo and a fun rearrangement of pixels as well. Well, that's not a problem anymore, as now you can make Duo calls to even those who don't have the app installed on their devices. For those who will receive a call for a Duo user, they will receive a notification and they will be able to receive by dragging up the phone icon and do most of the features found in Duo as if they have it installed.
For those interested in the intricacies, it's App Preview Messaging that's making all this possible - it is a Google Play Services feature that was launched back in 2016. At another side, users can answer the calls, mute the microphone, hold like a regular duo call, and change cameras.
A user with username "turdbogis" on a thread mentioning that a Nexus 6P unit, without the Google Duo app installed, was showing up as having Duo installed on another phone. Regardless, for those who will be receiving a call from a Duo user, they will have the option to decline as well as block future calls from the user.
Duo video calls can now reach users without the app
At the end of the call, these users will be prompted to install the Duo app; that will remain a choice. It is available only to select developers via an early-access preview program but did not make its way to all users of the app. Google's added a lot of new features and improvements since its release in 2016, but like any other communications app, it's faced the same issue of forcing you to encourage your friends and family members to actually download it so you can talk to them.
The system is based on Google's App Preview feature, which allows Android users to try out an application on their phone without first installing it. But it is not going to work with everyone on your contacts as the report shows that only some legitimate contacts are being listed.