Which iPhone do you think broke the most ground for Apple?

[iMore.com]

Every once in a while, a revolutionary product comes along that changes everything. Those were the words spoken as Steve Jobs hit the stage and introduced the very first iPhone to the world after having spent two and a half years working on the device. Looking back at that keynote, I'm not so sure everyone at that time felt the same way about it but if they didn't then, the chances are good that they do now.
The iPhone as a product has arguably gone on to reshape not only the smartphone industry but the wireless industry as a whole and while the very first iPhone takes much of that credit for a lot of people, a recent thread in the iMore*Forums asks which*iPhone do you think broke the most ground for Apple? Was it really the very first iPhone that took it mainstream popularity or was it another iteration?

Full story from the iMore Blog...