Google Duo allows you to call people who don't have the app

From Engadget - January 12, 2018

It's a good move for accessibility -- and should encourage those who do have the app installed to use it more widely. Additionally, it will help expand the user base. Cody Toombs at Android Police notes, though, that he was not able to reach all of his contacts through Duo. It's unavailable for all non-Android phones (sorry iPhone users, you will just have to install Duo first), but Toombs reports there are likely more criteria that play into who you can contact. However, it's unclear what they are.

This is all thanks to the App Preview Messaging feature, which allows Android users to use supported messaging apps to contact people who do not have said app installed. Google's smart messaging app Allo has supported App Preview Messaging since its launch, but the design for recipients without the app installed was a bit clunky. Android Police notes that it's been refined, giving a better preview for what it would look like if the person installed Allo.


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