The company feels that this one-on-one video chatting app will feel more human than others currently on the market.
Using the app, you’re free to reach anyone else based solely on their number.
The app is built to work even if you are on a slower internet.
It also switches between Wi-Fi and cellular data automatically without dropping your call.
Duo can also automatically reduce video resolution so that your important personal and business interactions are never interrupted.
However, the knock-knock is an Android-only feature.
Source:Google Blog
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source: www.techworm.net
