How to upgrade from Windows 8.1 to Windows 10 in Windows phone?

[Windows Central Question]

I have bought my self a lumia 640 xl which comes in Windows 8.1 and now as I heard that Windows 10 has been released how do I download it?? I'm staying in Dubai so has it been released over here?

 

[Indistinguishable]

Hi there. Windows 10 Mobile is not officially out yet. We're expecting it to begin rolling out to devices like the 640 XL in December. If you're interested in downloading the Insider Preview of Windows 10 Mobile, which is not the official release, but rather a developmental release, you can read about that here: How to install Windows 10 Preview to your Lumia Windows Phone | Windows Central