[The iPhone wasn't the world's best cell phone.] It was the world’s best portable computer. Best not in the sense of being the most powerful, or the fastest, or the most-efficient to use. The thing couldn’t even do copy-and-paste. It was the best because it was always there, always on, always a button-push away. The disruption was not that we finally had a nice phone; it was that, for better or for worse, we would never again be without a computer or the Internet.
—John Gruber, “The iPhone and Disruption: Five Years In“