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The statistic shows the worldwide revenue of the Apple iPhone per quarter since the third quarter of 2007. In the first quarter shown, Apple generated 5 million U.S. dollars selling iPhones and iPhone related goods and services. In the 2011 fiscal year, Apple sold 72 million iPhones. In less than 5 years the iPhone has become Apple’s most important product: in the 2011 fiscal year, iPhone revenue amounted to 47 billion U.S. dollars, representing more than 40 percent of Apple's total revenue. In the third quarter of 2011, 15 percent of all smartphones sold to end users were phones with the iOS operating system. In May 2011, Apple's market share in the U.S. smartphone market was 26.6 percent.