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Free call
Free call
Fring lets you make free phone calls using a phone's Wi-Fi connection as well as instant message on AIM or Google Talk.

Cost: Free

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Last updated August 19 2008: 12:59 PM ET
Phonemakers fight for software developers As mobile applications turn cell phones into pocket PCs, Apple, Research in Motion and Google are battling for the allegiance of developers. (more)
How the Apple iPhone ecosystem works The sudden rise of Tapulous illustrates how Apple is revolutionizing the mobile phone business. (more)