Mobile search marketing is still a small part of the search ecosystem. The number of G3 cell phones capable of providing mobile Internet service is still a small fraction of the roughly 200 million mobile phones now in use in the United States. But industry analysts have forecast robust growth for mobile search marketing. Mobile industry-watcher Informa predicts $1.7 billion in revenues for 2007 ramping up to $11 billion by 2011, making it a promising frontier for search marketers.