Popular free messaging and voice calling application Viber has launched beta versions for BlackBerry and Windows Phone 7.
Previously, Viber was available for iPhone and Android phones, mimicking the default contact list and allowing users to send messages and call other Viber users for free.
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Unfortunately, the freshly-launched betas do not support voice calls. For now, Blackberry and Windows Phone 7 Viber users can only message, which does include sending photos, texts and exchanging location information.
Viber also revealed some interesting stats about its app: It has more than 69 million global users, which send nearly 40 million messages per day and 1 billion per month. It's growing by more than 200,000 new users a day, which makes it -- Viber claims -- the "fastest-growing mobile VoIP and messaging company."
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This story originally published on Mashable here.