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Free calls and SMS on your iPhone ...fun to use! More than 606 million Viber users text, make HD-quality phone and video calls, and send photo and video messages worldwide over Wifi or 3G ...
- PROS: Very simple to use, Notifies you of contacts who are on Viber, Decent call quality, Send photos and videos, Stickers and emoticons to liven up chats, Group messaging with up-to 100 people, Hold & Talk feature
- CONS: You may have to convince friends to switch to Viber