I was thinking about getting the PLA book, but wasn't sure because it mostly seemed to be about pranking.
Does anyone know of useful books for phreaking (That are still relevant in the 21st century, of course).
I was looking about books about VoIP, switching systems, and GSM, but I don't think learning the protocols and everything like that would help me to much with what I'm looking for. And by phreaking, I don't mean hacking into 90's modems or something like that, I just mean being able to just play with the phone systems. Maybe like gaining access to switches or anything like that, I don't know much about phreaking so I can't give you guys very specific topics haha. But book suggestions would be awesome.
Thanks guys!