While the Allo was supposed to be the best messaging app even though they already had Hangouts which previously supported phone number integration, the company wanted it to be a standalone solution. Duo is based on phone numbers, allowing users to call someone from their contact list.
As reported by Android Police, the latest update in Duo includes this attribute to call users, with the spontaneity of an "Instant App" like experience called App Preview Messaging that's sported by Google Play services that allow Android users to receive calls through Duo.
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Hangouts may or may not be discontinued which we don't know at the moment. It's exactly how the Duo works but without it running on their smartphone. It is now being improved so as to reach more users. Talking about Google apps, the search giant's newest app to launch is Google Pay. Alongside this fun rearrangement of pixels, there was also a very real, very significant change made: You can now call people that haven't installed or registered with Duo in the past. On the other side, this could be annoying for the ones who don't like video-calling and get video calls without even having the app in the first place. "Duo will be a default calling service on all Android phones with Google services", said username wgn_luv on Reddit. This feature shows the live video of the caller before answering the call, which gives the recipient full power over answering or disconnecting the call. 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. Besides, the recipient will also have an option to block the caller.
This feature has now been spotted on Android phones. After the call ends, they would see a pop up to install the app. It's messaging app Allo is receiving a visual upgrade as well.