Surface Duo is the first Surface to fit in your pocket. Surface Duo brings together the best of Microsoft productivity experiences, Android apps and Surface hardware design into a single device you can take anywhere. And, yes, it makes phone calls. It has two paper-thin 5.6-inch screens that unfold to 8.3 inches, and just like Surface Neo, it can be used in a variety of modes to let you work the way you’d like.

To support Surface Neo, Microsoft are introducing Windows 10X, an expression of Windows 10 designed for a new category of dual-screen PCs. With Surface Duo we are building upon Android to marry cutting edge hardware with familiar software and services.

Source : Microsoft