> A SIM card is a full blown computer with its own CPU and memory. I read something to this effect years ago and mentally filed it away as “huh, that’s intere

> A SIM card is a full blown computer with its own CPU and memory. I read something to this effect years ago and mentally filed it away as “huh, that’s interesting.” This article is the first time I’ve understood what it actually means in practice, and it’s an eye-opener.