Microsoft’s Continuum for phone software lets you connect a phone like the HP Elite x3 or Microsoft Lumia 950 to a keyboard, mouse and display and use the phone like a laptop or desktop. But there are some major limitations: you can only run Universal Windows Platform apps, which rules out the vast majority of Windows software. And currently you can only view one app at a time.
But it looks like Dell was working on a phone that would have solved those problems, because it was a handheld device that basically had the guts of a cheap laptop… including an Intel processor that could handle legacy Windows software.
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I think the desktop version of Windows 10 is not a good mobile operating system for a phone because the Windows updates file sizes can be many GBs in size. Windows 10 also runs slow on mobile processors like the Intel Atom.