[ptx]

I think one of the things that made it different, and successful, was that it aimed for a compromise between a smartphone and a regular phone. (Although obviously not in terms of price!)

Compared to a regular non-smart phone it had enormous amounts of RAM and a hugely more powerful CPU, which enabled it to run a real web browser (as opposed to Opera Mini). It also allowed fancier apps in general, once they allowed them at all, but I think the browser was pretty much the killer app.

Compared to smartphones it got rid of the stylus. This made it less capable but a lot more convenient. Having to fiddle with the stylus every time you pull the phone out of your pocket was probably, I believe, one of the things that made most people reluctant to switch to smartphones.

Also, as far as I can tell, most phones in the US were pure garbage compared to what we had elsewhere, before the iPhone upset the control of the carriers and encouraged people to pay more. If the US market had looked more like Europe, perhaps the iPhone wouldn't have been seen as such a revolution.