About 60% of all US mobile web traffic goes through an Apple operating system. With iPad sales exceeding 25 million, the iPad generates 25.5% of mobile web browsing, with the iPhone adding another 35.2%. Their combined 60% almost doubles the 31.6% driven by the Android operating system; Blackberry come in at 6.9%, Symbian at 0.03%, and Windows Mobile at ).02%. (As a former Windows Mobile user, I'm not surprised at their abysmal performance).
On the bigger stage, iPad generates about 1% of all Internet traffic worldwide, and 2.1% of all US web browsing. Mobile and tablet systems combine for 5% of global web traffic (8.2% of US traffic).
Source: "Apple's iPad now generates 25% of U.S. mobile web traffic," Fierce Mobile Content