Something like 64% of all mobile web traffic is due to iPhones.
iPhone Makes Up 50 Percent of Smartphone Web Traffic In U.S. ...
Mar 24, 2009 ... The iPhone now accounts for 50 percent of mobile Web traffic from smartphones in the U.S., according to an AdMob Mobile Metrics report ...
**** My comment is there are a lot of mobile netbooks and laptops out there creating web traffic that has nothing to do with smartphones/iphones