Viber - Free and secure calls and messages to anyone, anywhere.

Viber is a calling and messaging app that connects people no matter who they are, or where they're from. Each month, hundreds of millions of people connect, for free, with their loved ones via messaging, high-quality voice and video calls and more. All Viber calls and chats are protected by built-in end-to-end encryption, so you can be sure that your conversations are always secure.

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Operating system Platforms (OS.)

Phone - Android, iOS, BlackBerry, Windows Phone, Symbian, Bada.

PC - Windows, Mac OS X, Linux.

Official Website (Japan) Rakuten Mobile JP.