You must have zero balance.
Goto google play store.
OR click below link.
Hi buddy, I have saved so much data by SkyVPN. It is a awesome app and let us enjoy the unlimited free internet together!Get it at
http://www.skydefend.net/fcp/?v=1&i=qY1wqt
Search for sky VPN.
Download using wifi or your network.
Now opn the app and tap to connect.
No close the app .
Turn off your data connection.
And turn on ufone data connection.
Now open the sky vpn app and connect.
Enjoy.......,...🎺🎺🎺🎺🎺🎭🎇🎆🎆🎆🎆🎆🎆🎆🎉🎉🎉🎉🎉🎊
You can earn premium 1000MB of data by referring your friends to SKY VPN.
Just copy and paste the link your reference.
Screenshot attached. 
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