In the Facebook post about the app is written "When you get a call, Hello will show you info about who’s calling you, even if you don’t have that number saved in your phone. You will only see info that people have already shared with you on Facebook. You can also search for people and businesses on Facebook and call them with just one tap. So if a friend tells you about a new restaurant in your neighborhood, you can use Hello to find their hours, make a reservation and get directions, all without leaving the app."
Here is a video:
You can test the app and see if it is for you now. But this is a beta so give time to Facebook and wait for the improvements in the Hello app.
Here is the app for the Android users in Google Play Store:
|This is the first app's icon from Facebook with the Material design style|