VPN Master Apps.
VPN Master is one intelligent apps that can run Viber, Line, Tango, WhatsApp, after all any internet phone and messaging services by installing the VPN (Virtual Private Network) Apps VPN Master (free Proxy).
After installing this App #VPN_Master, just add those services that want to run.
You have no need any passkey or user name. Enjoy the Viber, tango, etc by using the VPN Master from Google Play and Windows App Store.