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Dell unveiled the new phone, the Venue, and the tablet, the Streak 7, at the annual Consumer Electronics Show, which draws tens of thousands of buyers and sellers from around the globe to Las Vegas.Dell launched a smartphone late last year with Microsoft, using the US software giant’s Windows Phone 7 mobile operating system, but it opted for Google’s free Android platform for the latest device.Dell said the new Streak 7 tablet has a seven-inch (17.8-centimeter) screen, slightly larger than the display on the first Streak the company released last year.