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Viber for iPhone could give Skype a challenge

TUAW - Viber is a new free VoIP app for the iPhone. It allows you to talk using the AT&T data network, rather than the cellular network. I kept looking for a catch, but there isn't one. Works on WiFi and 3G. Check. You don't need to create a friends list. Check. Alerts you to incoming calls without the app being open. Check. No ads. Check.

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