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.
This means, for users who do not even have the app installed on their phones, an incoming call can instantly fly over the screen with a view of the caller's camera. However, these will be audio calls and the recipient has the liberty to accept, hang up, change cameras or mute their mic. But it's struggled to overcome the network effects advantage of apps such as WhatsApp and Hangouts: No matter how good Google Duo is, when all of your friends and family member use a platform, it's hard to get them to switch.More news: Norwegians decline President Donald Trump's offer to move to US
The ability to make Duo calls to people without it installed on their end should make it more accessible and reduce the complaints that "none of my friends use it". Once a call is ended, non-Duo users will see a notification prompt inviting them to download Duo for future use as well as a small notification that will allow users to block the caller from making future calls.More news: Wal-Mart's Sam's Club to shut stores after "review"
Google has made a very new and significant change to its Duo app. With the recent update, it has started appearing like Allo.
Another comment on the thread noted that Google Duo compatibility is now part of the stock Android Dialer and allows calls to non-Duo users. However, this isn't going to work with everybody on your contact list - iPhones and other non-Android devices are obviously off limits. The second list assigns an Invite button in front of the users.More news: Pakistan army chief: U.S. general called, offered assurances