The December 2016 AdDuplex report provides an overview of Windows 10 mobile phone usage, highlighting shifts in device rankings and market shares, especially influenced by Black Friday sales. The Lumia 640 overtook the Lumia 535 in global rankings, while in the U.S., the Lumia 650 and 950 claimed the top spots. Additionally, HP remains the leading PC manufacturer, and the market share for Windows 10 mobile has seen minimal growth, with Windows Phone 8.1 still being the dominant platform.