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Windows 10 icon blueDo you want to install Windows 10 for phones (technical preview) on your Windows Phone? Learn how to download and install Windows 10 for phones (technical preview). On February 12, 2015, Microsoft announced the first build of Windows 10 Technical Preview for Phones. So far, only certain Windows Phones are compatible to Windows 10 for Phones (technical preview), e.g. the Nokia Lumia 635. The Lumia 520 is yet not supported.