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The app lets users message and share files via Wi-Fi, even without an Internet connection
Need to communicate offline with a friend, but only one of you has YO! installed? Don't worry, you can share it over Bluetooth, no to download it from the Play Store.
Peer-to-peer messaging app YO! allows users to exchange much more than a simple "Yo" -- even when there is no working Internet connection.
Once you've installed YO!, you can scan the local Wi-Fi network for other users.