It's kind of a mixed bag here in the Midwest. You see some of the younglings constantly on them, some not at all or very little. Probably depends on their personality.
It is a tool. It can be a great tool, it can also be an oppressive master. Smart phones give the younger generation great instant access to all sorts of info good and bad. It can reinforce or bypass the leftist driven pop culture. It can be used to bully, or give a nice f/u to the bully. It can be used for terrorism, it can be used to save a life.
With the addition of social media, it can take some people back to cliquey immature high school, others use it to advance their career or economic situation. Some can't wipe their butt w/o the group's approval, others it makes them even more individualistic and independent.
Which is all to say - human nature hasn't changed, and smart phones conform to that like any other tool.