You can only use viber to call those who also have a viber account.
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You can use the viber application on your mobile or tablet. Calls or messages (including sending photos or location) made on Viber to other Viber contacts are absolutely free when selecting the button which says "Free Call" or "Free Message". Viber does not charge your carrier, nor Viber users. Calls or messages placed from Viber to "non Viber users" will go through your local cell phone provider like a regular cell call. Once you and your friends install Viber you can use it to make calls to your friend. Viber is out for iPhone and Android, and Viber Blackberry Free Download will soon be made available.
can downloads viber on BB bold 9000
A viber is slang for a person who picks up on others people's "vibes" in a social situation.
Viber blackberry official app is not launched yet. However Viber team confirmed that it will be released very very soon. May be in April 2012.
Viber messaging is hacked in a variety of ways however the most popular is using certain websites that cater to viber messaging, however often times there are fees associated with utilizing these sites.