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How much do you know about the British wireless phone giant Vodafone? Not much? Well, know this -- it's the world's biggest cell phone company by sales. And the reason Americans don't know that much about it is that stateside Vodafone co-owns Verizon Wireless. Today, Vodafone announced it had beaten expectations for customer and revenue growth. But the company angered some investors who want it to sell its stake in Verizon. From London, Stephen Beard reports.