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Skype is a proprietary software application that offers free Skype-to-Skype calls and low-cost local, national and international calls to both traditional land-line telephones and mobile phones.
Additional features include instant messaging, texting, call forwarding, and video conferencing.
Skype now also a premium version that has Group Video Calling. On Skype for iPhone, you can make free video calls to other devices with Skype installed, over both WiFi and 3G.
