74.1% of iPhone owners listening to mobile music in January 2008, compared to 6.7% of the total mobile audience, according to M:Metrics. 84% of iPhone owners who use an MP3 player use an iPod. Demographic composition of iPhone users, which are similar to the demographics of other smartphone owners. They are more likely to be: male, aged 25-34, earn more that $100,000 and have a college degree, than the average mobile subscriber.