If you are on a WiFi network, you have nothing to worry about, but do watch your usage on 3G unless you do have the unlimited data plan. Viber-to-Viber calls *are* free though they use your internet connection and or data plan. Calls on Viber are free and can be made over WiFi or 3G. Viber is a free iPhone app the lets you make free calls to anyone who also has the Viber iPhone application installed on their iPhone.
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