Microsoft has already assured that all the Windows Phone 8.1-powered handsets with at least 8GB of inbuilt storage are eligible to be upgraded to Windows 10 Mobile. But it hasn't revealed exactly when it plans to roll out the upcoming update. A new report has seemingly laid bare most of the plan.
The Redmond giant plans to roll out the updates in two phases, reveals mobile carrier Orange. Microsoft will release the Windows 10 Mobile firmware update to the Lumia 630, Lumia 635, Lumia 640, Lumia 735, and the Lumia 830 starting December 14.
In the second wave, the company will roll out the software update to Lumia 520, Lumia 532, Lumia 625, Lumia 720, Lumia 820, Lumia 920, Lumia 925, Lumia 930, Lumia 1020, and the Lumia 1320. The second wave is planned for February 1, 2016. For some reason, the Lumia 1520 is not mentioned in the list but it is likely due to nature of the availability of the handsets in the region. Only the unlocked version of the handset is on sale in Poland.
Of course, the exact roll out time frame could vary with regions and carriers. But this should give you an idea as to when your Windows Phone handset will receive the update.
The company reportedly plans to launch the Lumia 950 and the Lumia 950 XL, the first handsets to run Windows 10 Mobile out-of-the-box, on November 20. The handsets are expected to run Windows 10 Mobile build 10586 at the time of release.