Investors are watching Google (s goog) closely to see if the company can adapt to a world where more and more searches take place on smartphones and in apps. Today, the company rolled out an impressive sounding figure but provided few details about what it means.

On an afternoon earnings call, Google announced it had a run rate of $8 billion from its mobile business, consisting of revenue from ads, apps and content.

CEO Larry Page, still hoarse from a voice problem that silenced him for months, stated that the vast majority of that mobile revenue came from ads and that mobile is a “significant portion” compared to desktop ads. He declined, however, to provide specific figures or to disclose the margins Google is making on apps and content in the Play store.

The CEO likewise deflected a question about whether desktop ad revenue had “flat-lined,” and declined to say…