How Did Phreaking Work?
Reading about people abusing machines to achieve anything was unbelievably cool when I was a kid. Back then, they were called hackers, but nowadays, this name is taken over by Russian kids encrypting data on hospital networks.
One of those magical things was phreaking - a way to gain control over telephone networks. There were brute force ways and intelligent methods.
A few days ago, Connections Museum published a vlog explaining how the Blue Box worked. It’s well worth the time!