How Samsung Is Using the S6 to Challenge Apple’s IPhone

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An employee holds up a new Galaxy S6 Edge, left, and a Galaxy S6 smartphone device following their launch at a Samsung Electronics Co. news conference ahead of the Mobile World Congress in Barcelona, Spain, on Sunday, March 1, 2015.

Simon Dawson/Bloomberg

Samsung Electronics Co.’s S6 smartphones debuting Friday are raising analyst expectations for the first profit gain in six quarters as the company battles Apple Inc. for leadership in the global mobile market.

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