Whitepages.com has started serving display ads to users that access the company's directory listings from their cell phones. For now, the ads are sold on a cost-per-thousand impession basis, said
Derek Netelenbos, vice president of ad sales and operations for Whitepages.com. The ads have been in beta testing for a few weeks, while the mobile service itself quietly rolled out about a month
ago. Ford Motor Co. was one of the initial marketers to use the service.