
Santo last year opened offices in London and has WPP as a majority shareholder.
Santo has worked with Unilever's Lux brand and is working with Coca-Cola for its global marketing for the 2010 Fifa World Cup in South Africa.
Vodafone's global brand director David Wheldon insisted BBH would remain Vodafone's UK ad agency.
WPP is expected to also take on media responsibilities for Vodafone following plans to consolidate its £800m global media costs.