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An attendee shakes hands with a Monarch Robot at the Mobile World Congress in Barcelona, Spain, on Tuesday, Feb. 23, 2016. Mobile World Congress, an annual phone-industry event organized by GSMA Ltd., runs from Feb. 22 to Feb. 25. Photographer: Pau Barrena/Bloomberg via Getty Images

An attendee shakes hands with a Monarch Robot at the Mobile World Congress in Barcelona, Spain, on Tuesday, Feb. 23, 2016. Mobile World Congress, an annual phone-industry event organized by GSMA Ltd., runs from Feb. 22 to Feb. 25. Photographer: Pau Barrena/Bloomberg via Getty Images