Microsoft completes Windows Phone 8.1 update for new Lumia phones. The update code for Microsoft's mobile OS is being tested for new Lumia phones, says Windows Phone leader Joe Belfiore.
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Cortana: I want Microsoft's Windows Phone 8.1 developer Apr 14, 2014 Solved: HTC 8X Windows Phone 8.1 update - Page 2 - Rogers
1 The availability of Windows 10 Mobile as an upgrade for existing Windows Phone 8.1 devices will vary by device manufacturer, device model, country or region, mobile operator or service provider, hardware limitations, and other factors. 1.4 GB or greater download required.
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