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.
With just a couple of calls, Duo has proven to me that it can replace Skype on my phone and maybe even tempt me to use it instead of Whats App audio calls with certain friends.
Not because I to see them while I chat with them, but because the simplicity is there and it's enough to make me think twice before opening either app.
Once you've made a couple of calls, the bottom overlay will start populating with your most recent contacts. (You can't see me now, but you will in a while.) If you're a geek like me, the first thing you'll look for are the settings.
They're nested in the overflow menu, along with Help and Feedback, and there aren't many.
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Of the two communication apps that Google announced at I/O, Duo surely seemed like the less interesting one.
Video calls have been done again and again, and by now, if you have someone you want to talk to and see at the same time, odds are you already have your preferred way of doing that.
Compared to Facetime, Skype, Hangouts, and many other services, setup is faster and simpler, and usage afterward is more straightforward.