Knock Knock is on", along with a notice that says your friend - if he or she has you as a contact - will see you appear on their phone while you're ringing.In other words, don't assume your friend can't see you while you're ringing them, because they can, and that could lead to some embarrassing situations.
You'll then see options to go to Settings, Help, and Feedback. Under this menu, there are several settings you can change, including the ability to turn off Knock Knock. You can disable this feature under the Settings menu within the app (see 'Manage preferences' above). You can start your call at home, and continue seamlessly even when you head out the door.
You'll then be brought to the app's main interface: a screen that is split into two, with the top half showing you what your camera sees, and the bottom portion offering up a large video call button.
When you first see this screen, you'll be asked to give Duo access to your contacts.
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