Though AT&T won’t officially give you a way to use your iPhone to tether your laptop to an internet connection, it is looking the other way while an iPhone enthusiast has created a workaround. Good thing too, now that Apple accounts for more than two thirds of all mobile traffic in the United States. According to stats released by AdMob and reported on by Electronista , in April iPhone requests accounted for 59 percent of mobile web traffic. In May? A whopping 69 percent. BlackBerries were 13 percent and