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Part of what made Whats App so popular as a messaging client, and then again as a Vo IP alternative, was the low-entry barrier (plus free price and multiplatform support).If you wanted to send an SMS to someone, you must have had their phone number, which meant you could also contact them via Whats App — and for free. Duo is using this same low-entry barrier for video calls.Duo doesn't require usernames or passwords, not on your end nor on your friends'.

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.

And it can also be disabled, but keep in mind that if you turn it off, you won't send your stream to your contacts but you also won't get theirs when they call, regardless of whether or not they have it enabled or disabled.

Duo prides itself on two important features: adaptability to your connection speed (the quality of the stream drops if you're on a slow connection) and seamless transition between Wi Fi and data networks.

To achieve the latter, you'll see that Duo activates both Wi Fi and data immediately every time the app is opened, to make sure that the latter is already connected and ready should the Wi Fi signal drop. Now you may tell me that most of my screenshots in this post have a rather bad resolution.

Compared to Facetime, Skype, Hangouts, and many other services, setup is faster and simpler, and usage afterward is more straightforward.