Microsoft has released Windows 10 Technical Preview .
Download the Windows Insider app, and when your phone is supported you’ll be able to sign in with the same Microsoft account you used to join the Windows Insider Program. Windows 10 Technical Preview currently works with the following phones—as long as they have at least 8 GB of storage and Windows Phone 8.1 was already installed on the phone at the time of purchase:
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Lumia 630
Lumia 635
Lumia 636
Lumia 638
Lumia 730
Lumia 830
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