The screens are also tougher-they're real glass, not the flexible 'ultra-thin glass' that Samsung uses. Because the screens are separate, the gap between them doesn't give access to the innards of the device, allowing for a much slimmer hinge than on the Galaxy Z Fold 2. The Surface Duo is made of two glass slabs connected by a metal hinge. It's safe to say that the Duo is the first serious attempt at this dual-screen form. But those phones were from lower-profile companies, only appearing on one carrier each, with sluggish performance.

I remember the Kyocera Echo and the ZTE Axon M, both failed attempts at something like this form factor.

While it costs even more, the $1,999 Samsung Galaxy Z Fold 2 is a much more successful example of a folding phone. It's ambitious, certainly, but it's not entirely successful, with bugs and ergonomic issues that sometimes make the Duo confusing and frustrating to use. Now Microsoft is hoping to do the same thing on a smaller scale with the Surface Duo, a $1,399 phone-tablet that tries to enable those multitasking, productive workflows that never quite happen on your single-screen handset. Microsoft's Surface popularized a new category: the 2-in-1 PC.

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Surface duo