Besides the new video calling option, Google Phone and Contact app offers several useful features as well. For example, it allows you to answer or reject calls from the notification, caller ID, automatically backup all of your contacts to the cloud, spam protection, block calls and others, etc.
Changelog of Google Phone app (13.0.171616398): Various video calling app like Skype, Facebook, WhatsApp and others, etc. are available for Android phones, but what make Google’s Duo is different from all those is its simplicity, fast and reliability. Duo can bring better audio and video quality, even over slow connections by utilizing Google’s WebRTC framework. Updated Phone app is now available for Android 6.0 Marshmallow and newer devices. The update will improve your calling experience and experience features like Google Duo video calling, spam protection, and caller ID. You can update the app to latest version from Play Store [here] or download the latest APK from APKMirror [here] and sideload it.