As a student, (back in the early '90's), I was shocked to be told that before the end of the decade, nearly everyone would have a mobile phone. I think I was one of the last few who held out, finally giving in and getting one in '97 - and now they are considered essential to modern life!
As my own contract is up at the end of the year, I have watched with interest, as various new phones have been released, and my colleagues' behaviour as each of their contracts have run out too (it certainly tells you a lot about the psychology of people).
And people watching is great! In my particular office, we seem to have representatives from all different walks of life. We have the office nerd, the apple fanboy, the guy with little money and even less sense, the tightwad and the admin staff, most of whom are teenagers. It all builds up to give a great picture of what does and doesn't work, and the best way for finding the best value deal for yourself.