What is Voice over Internet Protocol (VoIP)? Is a family of transmission technologies for delivery of voice communications over IP networks such as the Internet or other packet-switched networks.

MobileVoIP - Mobile voip calls on Winows Phone 7.mp4

Found this on moviltoday.com It's a review of a great app called MobileVoip which enables free VoIP calls on Windows Phones. It's also available for Symbian/Nokia, Android and iPhone. It can send text messages as well and offers various ways to call.

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