Taking the limelight on the opening day of the world's biggest mobile fair in Barcelona, Spain, the South Korean giant simultaneously revealed a connected bracelet for health-concerned customers.
Samsung made about 30 percent of all smartphones sold in the world last year, nearly twice the share of archrival Apple, which traditionally skips the annual World Mobile Congress.
But Samsung, which announced its new devices on the sidelines of the February 24-27 event, is nevertheless scrambling for new revenue sources as competition in mature markets intensifies.
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In a struggle to stand out from the competition, including a rising challenge from China, Samsung showed off the Galaxy S5 with a light sensor on the back that gives a heart rate reading when the user touches it with his or her fingertip.
Though the case is plastic, as with earlier versions of the Galaxy series of smartphones, it is water and dust proof, and has a leathery feel on the back.
The smartphone boasts a full high d