Japans answer to Amazon, Rakuten, has just got into the mobile communications business by purchasing internet calling app-maker Viber for $900 million. Viber was one of the first to introduce 3G VoIP on the iPhone, and now lets you call any land-line or mobile phone, send messages and even push-to-talk. The app is available on all major mobile and desktop platforms, and is one of Skypes biggest rivals with over 300 million users worldwide.
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