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Old January 7th, 2013, 12:49 PM   #9 (permalink)
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Some mobile operators across the world block Viber on their 3G network. Usually this happens when users have a "simple" data plan (or a prepaid contract), meaning they didn't pay extra for using VoIP on their 3G network.

In order to verify this, we recommend to:
1. Test Viber on a few different WiFi networks, and see that it works fine.
2. Contact your cell company and confirm this with them.
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