Skype

Skype uses your phone's data connection to make free calls to other Skype users. And unlike Apple's FaceTime video chatting feature that only works on Wi-Fi networks, Skype users can video chat with each other over a 3G connection. Add in low-cost international calling plans, built-in instant messaging functions, and CD-quality voice transmission and you've got this whole communication thing covered from just about every angle.

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