Samsung Electronics used a glitzy presentation that it streamed live from New York on Thursday night to introduce the Galaxy S4, an Android smartphone that ratchets up the South Korean company's competition with Apple and will reach six carriers in the U.S. market next month. New software includes eye-tracking, gesture control and sensors that monitor the weather and the user's health. On the hardware side, the 5-inch Galaxy packs a 1.6 GHz eight-core Exynos 5 Octa chip or a 1.9 GHz four-core processor, two cameras that can be used simultaneously and supports global roaming for Long-Term Evolution networks, Samsung said.

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