Microsoft indeed rolled out the long awaited Windows 10 Mobile upgrade to Windows Phone 8.1 users on March 17.
The rumors turned out to be true. Microsoft is rolling out Windows 10 Mobile to select Windows Phone 8.1 devices. The list of supported Windows Phones includes Lumia 1520, 930, 640, 640XL, 730, 735, 830, 532, 535, 540, 635 1GB, 636 1GB, 638 1GB, 430, 435, BLU Win HD w510u, BLU Win HD LTE x150q and MCJ Madosma Q501.
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This list includes a limited set of Windows Phone 8.1 devices and does not include some devices that are currently running Windows 10 Mobile in the Windows 10 Mobile Insider program.
As Windows 10 is a major upgrade many older devices are not able to successfully upgrade without an impact on the customer experience. Microsoft is only offering Windows 10 Mobile for devices where they are confident that phone can continue to deliver a good customer experience.
Microsoft offers a Windows 10 Upgrade Advisor app that can be downloaded from the Windows Store. To check if the upgrade is available for your Windows phone and install the upgrade, go to the Store, install the Upgrade Advisor app, run the app to see if the update is available, and then select Enable Windows 10 upgrade.
Because of the size of the update, a Wi‑Fi Internet connection is required for download and installation.
When the update to Windows 10 Mobile becomes available, on Start Start icon, swipe over all to the All apps list, and then select Settings Settings app icon->Phone update, and then install the update. You can choose to install the update immediately or postpone the update for a more convenient time. More details on how to install the Windows 10 Mobile update are available on this support page.
The Windows 10 Mobile Update comes with about a 3-month delay. Finally the remaining Windows Phone 8.1 users can get the new features available in Windows 10 Mobile including Cortana and Continuum.