Chief Executive Officer of Microsoft, Satya Narayana Nadella speaks during a presentation at the Mobile World Congress (MWC), on the eve of the world's biggest mobile fair, on February 24, 2019 in Barcelona. - Phone makers will focus on foldable screens and the introduction of blazing fast 5G wireless networks at the world's biggest mobile fair starting tomorrow in Spain as they try to reverse a decline in sales of smartphones. (Photo by GABRIEL BOUYS / AFP)        (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)
GABRIEL BOUYS/AFP/Getty Images
Chief Executive Officer of Microsoft, Satya Narayana Nadella speaks during a presentation at the Mobile World Congress (MWC), on the eve of the world's biggest mobile fair, on February 24, 2019 in Barcelona. - Phone makers will focus on foldable screens and the introduction of blazing fast 5G wireless networks at the world's biggest mobile fair starting tomorrow in Spain as they try to reverse a decline in sales of smartphones. (Photo by GABRIEL BOUYS / AFP) (Photo credit should read GABRIEL BOUYS/AFP/Getty Images)
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