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OK, so once a friend has Duo installed, hit the video call button, then find your friend on the contacts screen, and tap his or her name.
The first time you call, Google will tell you "Smile!
It is also great for current teachers who are looking for more hours.
Personally, I teach English face-to-face in the morning and online with Skype in the afternoon.
Manage preferences While on the app's main interface (the camera view/video call button screen), tap the three-vertical-dots button in the upper right-hand corner. Duo has a feature called Knock Knock that lets you see live video of your caller before you answer. The voice-calling feature is available to Duo users worldwide. For video calls on the go, Duo will switch between Wi-Fi and cellular data automatically without dropping your call.
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.
It's easy to use, too, because the app's interface is ridiculously simple.
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.