Given the great demand that exists on apps to make free calls between mobile devices, Tango he was not left behind and already updated his version for Android and iOS.
This application that already has its own social network due to the characteristics it has, has added the so famous "seen" that is reflected on Facebook. With Tango update for Android and iOS we can know when a person read our message, saw our video or any file that we have sent.
I also include in this version technology filters used by Instagram for photos. Animated avatars are also part of Tango for Android and iOS, where we have a cat and a dog moving their mouths in real time as we make a video call.
And if that weren't enough this app for free calls I also include the game Checkers. Apparently Tango wants to stomp in the market for free applications for video calls between mobile devices.