Samsung Electronics, Nokia and Huawei Technologies unveiled smartphones at an industry event in Spain with Samsung showing off its 8-inch Galaxy Note "phablet" that it plans to roll out in the second quarter in North America and elsewhere. The South Korean electronics firm, which did not reveal the Galaxy Note price, will also reportedly release its first smartphone based on the open-source Tizen platform this summer. Nokia announced a pair of Lumia models, the mid-range 720 and the budget-line 520, but offered no information on a U.S. release for the 720. T-Mobile USA is set to ship the 520 in the second quarter. And Huawei introduced its Android-based Ascend P2, which it termed the "world's fastest smartphone."
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