So if you want to make a video call to any of your friend on Duo and they have not installed the app. But, most of the Google messaging apps are caught up in a hitch at this stage, pushing few users towards either Allo or Duo. It is one app that has been used to replace the previously popular Google Talk which later became GTalk. Most people didn't have it installed and even if you had it, it was tough to place a call to those on the other end. Google Duo was had a simple yet efficient interface that immediately allowed you to place a video call without a fuss. It works nearly exactly like a normal Duo call, including the Knock-Knock feature. Well, we have good news- Google has not added that feature, allowing Duo users to dial up and video chat with anyone on their contacts list.
It all happens through something called App Preview Messaging, which works through a background Android app called Google Play Services. Users who received a call from a Duo user but do not have Duo installed themselves can answer the call by dragging the phone icon up.
Android Police spotted the update, which means audio and video calls will pop up on some Android phones even without the app - it's not clear exactly what the criteria for this is, but having your phone number registered with Google seems to be part of it.
As soon as the call is made, the recipient will immediately be able to see what is being shown through the caller's camera.
The company is also reportedly working on versions of the app for web browsers, and group calls with better audio quality.
This feature has now been spotted on Android phones. As such, at the conclusion of a call between a Duo user and a non-Duo user, the latter will see a prompt imploring them to install the app, if they are interested in starting video calls of their own. It's messaging app Allo is receiving a visual upgrade as well.