Teens have been the most voracious online users for years. What’s changed in the past year is that they’re increasingly accessing the Internet on the go (thank Apple for that). A Pew Research Center study, Teens and Technology 2013, found that while cellphone ownership has held steady, 37 percent of kids 12-17 owned a smartphone in 2012, up from 23 percent the year before. Moreover, one fourth of teens use the cell as their primary way of accessing the Internet, and among smartphone owners, that figure rises to 50 percent. (Only 15 percent of adults can say the same.) No wonder that, with smartphones allowing Internet access along with talking and texting, kids more than ever always seem to be on the phone.