I spent a single detached year at college, so I can't speak to that difference, but I did notice a big change when the iPhone surpassed "early adopter" stage. There were always people perpetually focused on their Blackberries/two-ways, but they tended to be a select few: Hardcore careerist types and the young-&-gossipy crowd. This seems to have expanded to include everybody from soccer moms to computer geeks, to ten year-olds!