Windows 10 technical preview is available to download in six smartphones Lumia 630, Lumia 635, Lumia 636, Lumia 638, Lumia 730, or Lumia 830 .Microsoft promises more handsets will be added to subsequent Preview builds in the future .
User should have one of above window phone for technical preview if he wants to use it. He need to first join the Windows Insider Program. Then he has to install the Windows Insider app, start it up, register the device, then check for updates. As work on Windows 10 for phones progresses, user will get all the new builds, including the final one when that’s out.
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