Data use on a typical US smartphone has shot up 50 percent in just half a year, a newly published study by analyst Chetan Sharma has discovered. In the first half of 2010, the average bandwidth used climbed to 230MB, or enough to eclipse AT&T's cheaper plan introduced at the very end of the period. The usage is some of the heaviest in the world, as Japan and Korea have further 3G reach but use it significantly less.
