Windows 10 powering 270M devices; anniversary update coming for free
Windows 10 powering 270M devices; anniversary update coming for freeREUTERS/Thomas Mukoya

The wait has finally come to an end. Microsoft has rolled out the Windows 10 Mobile update to select smartphones running the Windows Phone 8.1 operating system after months of waiting. The software update will be pushed out to the Lumia and other eligible devices in phases.

"Today, we're pleased to begin the roll-out of Windows 10 Mobile to select Windows Phone 8.1 devices, [sic]" announced Microsoft in a statement. "Consistent with our approach to the Windows 10 PC upgrade, we are focused on delivering a high quality experience for our customers [sic]." 

Microsoft devices eligible for the Windows 10 Mobile OS update are the Lumia 1520, Lumia 930, Lumia 640, Lumia 640XL, Lumia 730, Lumia 735, Lumia 830, Lumia 532, Lumia 535, Lumia 540, Lumia 635 1GB, Lumia 636 1GB, Lumia 638 1GB, Lumia 430, Lumia 435, BLU Win HD w510u, BLU Win HD LTE x150q and the MCJ Madosma Q501.

[Read: Windows 10 Mobile update schedule: Will Lumia devices get firmware in March?]

Microsoft handset users can check if the upgrade is available for their device by downloading the Windows 10 Upgrade Advisor app from the Windows Store.

The software giant said "many older devices are not able to successfully upgrade without an impact on the customer experience" and that its "goal is to only offer the Windows 10 upgrade to devices that we are confident can continue to deliver a good customer experience."

[Read: Windows 10 Mobile to be rolled out today?]

Microsoft had earlier announced the Windows 10 Mobile update would be made available to devices running Windows 8.0. It is still not known when these devices will get the software.

It may be recalled that Microsoft handset owners have been waiting for the Windows 10 Mobile update since December. It was even rumoured that it had been rolled out to a couple of Lumia devices. However, Windows Blog Italia's report, that it would be released March 17, came true.