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The Microsfot Lumia 640 and 640 XL are displayed during the Mobile World Congress in Barcelona March 3, 2015. Ninety thousand executives, marketers and reporters gather in Barcelona this week for the telecom operators Mobile World Congress, the largest annual trade show for the global wireless industry. REUTERS/Albert Gea (SPAIN - Tags: BUSINESS SCIENCE TECHNOLOGY BUSINESS TELECOMS) TELECOMS-MWC/

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