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CANNES, France—An endearingly quirky billboard campaign for Google Voice Search, featuring more than 150 site-specific ads with phonetic spellings of nearby landmarks, has earned London agency Manning Gottlieb OMD the Grand Prix in Media at this year's Cannes Lions festival here.
Creative agency BBH in London came up with the idea for the phonetic ads—perfect for a product that allows you to speak your search queries instead of typing them. But it was Manning Gottlieb OMD that really turned the campaign into a triumph.

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