Windows 10 Mobile build 10166 rolling out now to the Slow ring

Windows 10 Mobile build 10166 rolls out to the Slow ring, Microsoft ins't saying what has been fixed.

Windows 10 Mobile

Microsoft announces today that Windows 10 Mobile build 10166 is now available through the Slow ring of updates. The news comes after twelve days since the company rolled out the same build to the Fast ring, and seven days ahead of the official release of Windows 10 for PCs and tablets.

Making the mobile operating system available through the Slow ring simply means that the company has worked most of the important bugs and now the software should be more stable and polished to install on Windows phones.

The announcement was made by Gabriel Aul, head of the Windows Insider Program via Twitter.

As it was previously reported, Windows 10 Mobile 10166 doesn’t include new features, it only brings small changes and feature tweaks, and the build is focus on improving the core quality of the software.

In addition, the company has fixed many of the known issues, such as “post-upgrade migration status screen was missing, which made the Lock screen appear frozen without the date and time for up to 10 minutes.”, the unlocking your phone after entering a PIN should also work, colors in apps now render correctly, and a few other changes.

Remember that you need to have the Windows Insider app installed and configured to receive new updates through the Slow ring, then go to Settings> Update & Security > Phone update to check for build 10166.

About the author

Mauro Huculak is a Windows expert and the Editor-in-Chief who started Pureinfotech in 2010 as an independent online publication. He is also been a Windows Central contributor for nearly a decade. Mauro has over 12 years of experience writing comprehensive guides and creating professional videos about Windows, software, and related technologies, including Android and Linux. Before becoming a technology writer, he was an IT administrator for seven years. In total, Mauro has over 20 years of combined experience in technology. Throughout his career, he achieved different professional certifications from Microsoft (MSCA), Cisco (CCNP), VMware (VCP), and CompTIA (A+ and Network+), and he has been recognized as a Microsoft MVP for many years. You can follow him on X (Twitter), YouTube, LinkedIn and