For a snapshot of the mobile future, look no further than 16-year-old Lara Breedlove.
"I use my phone for everything," said Breedlove, of Chanhassen. "You have so much power with this little device."
On her iPhone4, she texts, talks, posts to Instagram and Facebook, plays word games, even tracks practical stuff like schedules. It's also her de facto gadget for searching the Web on a moment's notice.
As smartphone prices drop and parents pass along their hand-me-downs, teens like Breedlove are eager to play with these new tech toys. Thirty-seven percent of U.S. teens now have smartphones, and they're showing adults how the mobile world works. They're also giving parents one more thing to worry about, roaming the Web largely unsupervised via handheld devices.
Among teenage smartphone users, 50 percent use that device for primary access to the Internet, according to the Pew Research Center. For adults, that number falls to 25 percent.
"Teens see the utility," said Amanda Lenhart, a senior researcher at Pew Research Center. "The teens who do use [smartphones] show us a potential window into our future."
The mobile frontier has people and businesses scurrying to develop websites and smartphone apps to make life easier, from mobile payment systems to location-based marketing and social networking. For some parents, those advancements are troubling. Teen enthusiasm can propel a game or app to popularity, as seen recently with the photo app Snapchat.
As more teens acquire cellphones, the question shifts from "How young is too young?" to "What are kids doing with these devices?" For teens, much of the adaptation to cellphone browsing is a matter of convenience.