Overnight, Microsoft released the first build of Windows 10 Technical Preview for Phones to members of the Windows Insider Program.
Using the Windows Insider App on Windows Phone 8.1 you can register for the over the air updates. However, the update is not available to everyone yet as it has only been released for a subset of Lumia phones.
So if you have a Lumia 630, 635, 636, 638, 730 or 830 you should be able to get the preview code installed.
WARNING: While there are some great features coming, you must remember that this is very early code and will have bugs and some features will be missing or not working.
To learn more about the features and to understand the known issues, please watch the video and read the article below:
Windows 10 for Phones (direct link)
For more information, see the full article on Blogging Windows blog:
This article was originally posted on http://www.winthropdc.com/blog.