In July 2009, a month after the iPhone 3GS was launched, 6.6 million U.S. mobile users reported having an iPhone. Over the next two years, during which the iPhone 4 was released on both AT&T's and Verizon's networks, that number increased to 22.2 million mobile users, showing a staggering increase of 235 percent.Who are these iPhone users? These insights and more can be found in the report. To download a complimentary copy, please visit iPhone 5: Implications for the Operator Industry.