At the I/O developer conference, Google presented a bunch of new products, including Duo, an application that enables video calls even with a poor Internet connection, which otherwise conditions the operation of any such online service. The duo has no problems with the internet connection, even if the signal is really weak, thanks to the in-house QUIC protocol.
Duo is simple but the most reliable video calling app, as it works flawlessly even if you use wireless network with a weak signal (QUIC protocol), which is the main reason why people repeatedly do not access this kind of online service. In addition, you don't need to create a new account to use it, because Duo's account based on mobile phone number.
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The Duo app is available for the operating system iOS and Android and will be available from summer 2016. However, the application has one rather unusual feature. Live picture of the caller is displayed on the recipient's screen even before the recipient answers the call.