Microsoft's newest Lumia phones, Lumia 950 and its large screen sibling 950 XL, are the first to ship with the Windows 10 Mobile operating system. Lumia enthusiasts will get an opportunity to experience the new Windows operating system once the Lumia phones go on sale in November. But if you own any other Lumia model, you will not have to wait for a long time, as the rollout is only a couple of months away.
In response to a query related to the Windows 10 Mobile update for a Lumia phone, Microsoft said on its official Lumia Facebook site that the update will start rolling out in December. It further adds that their ambition is to make the upgrade available for a majority of Lumia phones running on Windows Phone 8.1.
At least 8GB of internal storage is required for the upgrade, which means mid-range phones like Lumia 530 with 4GB storage capacity will be out of luck. As confirmed previously, Lumia 430, 435, 532, 535, 540, 635 (1GB RAM), 640, 640 XL, 735, 830 and 930 are eligible to run Windows 10. But not all features will be available for all devices.
Considering the December rollout, the Windows 10 Mobile RTM (release to manufacturing) is expected in a few weeks. Windows Insiders are likely to receive the RTM version soon once it is ready for the Insider Programme. WinBeta claims Microsoft is currently in the final stages of development, busy squashing last-minute bugs and giving finishing touches to the OS. The test builds are no longer branded as "Windows 10 Mobile Insider Preview"; instead they simply come as Windows 10 Mobile.