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It works over 4G, 3G and Wi-Fi networks, allowing free (data charges may apply) voice and video calls to other Skype users. Company officials said the Windows Phone version interoperates with Skype for Windows 4.2 and above, Skype for Mac OS X 5.0 and above, Skype for Linux, Skype for iOS 3.0 and above, Skype for Android 2.0 and above, and Skype for TVs.
Skype for Windows can also be used to place calls to fixed lines and mobiles at rates that are often lower than those charged by mobile carriers.
Changes to Skype for Windows since February's beta release include video calling in portrait mode, and a range of contact management capabilities.