Google Duo - How To Set-up And Use Duo Video Calling App

Google Duo is the new, simple video calling app that brings you face-to-face with all the people that matter most.One of the more appealing aspects of Duo is the fact that it doesn't require a Google account to use it. Instead, Duo uses your phone number which making it easier for you to call/chat with the contacts that are already in your phone.
If someone you don't know is calling you, or a friend is calling from a new phone number, Knock Knock won't work. The same thing happens when you call someone. If your number isn't saved as a contact, Knock Knock is off by default.
With Duo, you can get closer to everyone you love with simple, high-quality video calling on iOS and Android. Google Duo is very easy to use and the set-up is simple. The first time you launch Duo, you're asked to enter your number. Google then sends you a text message containing a code to enter. Once you've verified your number, you're signed up and ready to start using Duo.
To Set-up Duo Video Calling
1. Download Google Duo from Google Play Store hereor from iTunes Store here
2. Open the app you downloaded. 
3. Agree toGoogle's Terms and Conditionsfor the Duo app.
4. If you're running Android 6.0 or higher, you'll have to accept permissions one-by-one at launch:
*.AllowDuo to take pictures and video so that the app (and whoever calls you) can see you.
*.AllowDuo to record audio so that the app (and whoever calls you) can hear you.
*.AllowDuo to access your contacts so that it can see which of your contacts are on Google Duo and who you could invite to the service.
*.AllowDuo to send and view text messages so that it can send invites to your contacts and so it can see the verification code you'll receive in a few steps. 
5.Type in yourphone numberto use with Google Duo.
6. Your phone willreceive a text messageto verify your number. It may automatically read the verification code or you’ll need to enter it manually.
7. Now your Duo is set and ready to use.
To Make a Call With Duo
1. Simply TapVideo Call.
2. Select thepersonyou'd like to call from your contacts ortype in the numberyou'd like to reach.
4. Duo will call your contact,making your video visiblewith Knock Knock.
5. To end your call, tap thered phone button in the bottom centerof your screen.
Google Duo Settings
Go to Google Duo settings by tapping the three-dot menu in the top-left corner of the app's main screen and selecting Settings.
*.If you don't want the people you call to see you before they accept the call, you canslide the togglefor Knock Knock off.
*.By default, the setting to limit mobile data usage is on, knocking down the video quality when you're away from Wi-Fi, so if you want full video quality this is where you canenable it.
With Duo, you can see a video of who's calling before you pick up. No dulling, install Duo and start flexing with less data consumption via Duo video calling. I