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The Mobile World Congress in Barcelona always has a bit of carnival barker’s edge, as everyone from giant phonemakers to the most obscure startups vie for the attention of some 100,000 attendees. This year, in addition to the usual packed hands on areas for playing with the latest devices from Samsung, Sony, and others there are a couple of autonomous air taxis you can sit in for a “ride” in virtual reality, a Batman versus Scarecrow VR game, and some kind of Google scavenger hunt that was little too convoluted for this busy conference goer.

But it’s a couple of the items that you can’t touch that are drawing the biggest crowds. Samsung, Huawei and TCL have all announced one form or another of phones that unfold into larger-screened tablets. And they’re all here on site–locked up in sealed glass cases. Samsung’s Galaxy Fold, which has a phone screen on the outside and opens like a book with a separate 7.3-inch screen on the inside, is set in a mini funhouse hall of mirrors display case that makes it hard to see the sides. That may be because the device is on the thicker and heavier side compared to the…