Why Smartphones are so popular?

Because there is a lower-case I in front of the Word Phone. lol

BUt seriously. The newer ones are a major improvement on the last couple iphones. They are pretty nifty, what with all the apps and touch screen, etc. Also, it was the first mainstream smartphone to hit the market. The publicity created for it was unmatched, so that helped create a lot of hype that has stuck around.