https://www.engadget.com/2017/10/12/google-duo-voice-chat-android-facetime/
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https://www.engadget.com/2017/10/12/google-duo-voice-chat-android-facetime/
origin - http://www.pipiscrew.com/2017/10/googles-duo-voice-chat-app-is-about-to-become-androids-facetime/ googles-duo-voice-chat-app-is-about-to-become-androids-facetime