Google Duo is an application capable of holding video chats. Its simplicity is carried even into the user interface. It works by using your phone number. When you launch the app, the camera will start recording your face enabling the ability to create video calls. This application works both with the front camera and back camera. With a simple press of a button, you can select the contact from your phone and initialize a call.
When someone is video calling you, you see an image from their camera right away, and you can decide if you pick up the phone or not. If you want to call a contact and they aren't able to answer you, Google Duo allows you to leave a video message. Another good thing about this service is that you can also create regular voice calls.
Regarding configuration and settings, users can set the app to vibrate the phone while ringing, limit mobile data usage, unregister your phone number from this app, block numbers. This simple app works on smartphones and tablets.