Sprint Nextel on Wednesday unveiled the HTE Evo 4G LTE smartphone, which contains "HD Voice" technology to deliver clearer calls along with a string of high-tech features on the Android 4.0-powered handset. The carrier's flagship Long Term Evolution phone will carry a 1.5 GHz dual-core processor, 8 megapixel camera and 4.7-inch HD screen. Sprint said that it will begin taking pre-orders on the $200 smartphone on May 7.

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