GOOGLE duo usp ia its simple and snappy interface.to download the app u can jump into appstore/playstore.this app is free and available for both android and iphone user.it comes with an interesting option named knock knock which allows the person you are calling to c u even before he/she answered the call.the app is really intelligent in various situation.accordinh to connection it jumped to suitable video quality.
the app overall is quite neat and given google’s confidence, we won’t b shocked if people startimg shifting to duo as their primary video calling app