Teens with cellphones are using them for mobile data much more than in the past, Nielsen determined in a new study. Although messaging is still the favorite, about 49 percent of those aged 13 to 17 were using their phones for full Internet access in the spring, not just MMS or SMS. The number was up from 40 percent a year earlier and was mirrored by apps and e-mail, which shot up nearly as much to hit 38 percent.
