This basically shares the caller's video stream before the recipient answers the call, as a way to entice them to pick up the phone.Thankfully, Knock Knock doesn't work for contacts you don't have in your address book - a nice way to avoid unsolicited images from people you don't know.All you need to contact someone on Duo is their phone number, which more often than not you already have for all the people you might want to video call.
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Of the two communication apps that Google announced at I/O, Duo surely seemed like the less interesting one.
They're nested in the overflow menu, along with Help and Feedback, and there aren't many.
You can set the phone to vibrate or not when receiving a call, limit mobile data usage, unregister your phone number in case you're switching numbers or don't want to use Duo anymore, see and manage your blocked numbers, and activate one of Duo's unique features: Knock Knock.
Audio-only or group video calls aren't yet possible, there's no web or desktop client, no multi-device support, and no way to share what's on your screen for example instead of what you see with your cameras.
But even though these seemed like deal-breakers to me when the app was announced, after using it for a few days, I'd argue that they're secondary features to what Duo is trying to be: an instantaneous way for you to get in touch with someone else as if you were near them.
If I dare say it, it's the millennial's () approach to video calls.