I'd say the main difference is that you couldn't take a device with good media capabilities, good and cheap-ish networking and lasting battery everywhere. Laptops, netbooks, tablets were a tad too bulky, lasted only a few hours unplugged and mainly wifi, and mobile internet was not all that great.
True leading up to 2010. The couple of kids who had the original iPhone or the 3G were unusual. Most of my classmates - including myself - got one between the 4 (2010) and the 5S (2013).
