In testimony that appeared to be crafted specifically to downplay any revenue generated by Android, Google's mobile head Andy Rubin told prosecutors in the ongoing trial with Oracle over Java licensing that the system exists mainly to "make it easier to access Google services" and that he did not expect the OS would contribute significantly to Google's ad revenues. While Google makes around $2.5 billion in mobile ad revenue every year, a substantial portion of that comes from iOS advertising rather than Android ads.