T-Mobile US has released a software update for the Windows Phone 8X by HTC that is now available for download. The software update will be available by Over The Air (OTA) which will provide an improved audio experience for the Skype application from Microsoft.
OS version 8.0.10211.204 / Firmware version 1532.20.20008.531, Launched January 28, 2013
Features audio experience improvements for the Skype application
You will see a notification that the software update is available for your phone or you can manually update when it from phone update > check for updates on your device.