If you still own the Yezz Billy 4.7, you're now free to install Windows 10 Mobile Insider Preview builds on it. The Windows Device Recovery Tool was recently updated to support the device.
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Yezz Mobile has announced its latest Windows Phone 8.1 smartphone, the Yezz Billy 5S LTE, with decent mid-range specifications at the CES 2015 trade show in Las Vegas.
