In this month's AdDuplex report, a surprising increase in devices running Windows 10 Mobile has been confirmed with 4.7 percent of all devices running the new OS. The numbers reflect a 1.4 percent increase from last month and strongly suggests that more users are taking advantage of Microsoft's free Insider preview program.

Windows 10 Mobile is expected to be released next month after Microsoft's New York City press event on October 6. Those who are part of the Insider program will get the update first before carriers begin to provide officially over-the-air updates. Additionally, new hardware running Windows 10 Mobile should be in people's hands by early November.

What to expect from Microsoft's Windows 10 devices event in NYC

The increased adoption of Windows 10 Mobile – even in beta form – is likely due to the growing stability of the OS making it more appropriate to use on people's daily phones. Microsoft still likely has a few builds before the OS is "finalized" for the actual release, however, meaning there is still more to come.