LOL. Just to add on to the comment, it doesn't even have to be 3g/4g. If you're doing Wifi on an ESP8266, you're probably also using AT commands as well. Although it's really nothing like the Hayes command set.

In any case, it fills me with equal parts nostalgia, awe, and fear. :)

https://docs.espressif.com/projects/esp-at/en/latest/esp32/A...