Subscriber Identity Module. That's what “SIM” stands for. I acquired my first SIM when I was 17 at a T-Mobile outside Chicago when I got my first cell phone, the Nokia 1110, the best-selling phone of all-time.
A few years later I was working in Chicago and almost everyone in the office had an iPhone. But a few people had Android phones. Their phones did so much my dumb phone couldn't do. Though having grown up in an analog world the idea of the phone doing everything concerned me in that I would grow dependent on it.