[plapsley]

Oh yeah. Something I was so interested in, I wrote a history book about it: https://explodingthephone.com/

If you like old documents, check out, e.g., https://explodingthephone.com/search.php?q=captain+crunch&so...

Someone mentioned phrack above. There was (still is!) also 2600, and before that, YIPL/TAP, the original phone phreak newsletter: https://archive.org/details/YIPLTAP_1-91

If you get up Seattle way ever, be sure to check out the Connections Museum, where you can see not just old telephones, but old telephone switching equipment, lovingly maintained by some amazing people: https://www.telcomhistory.org/connections-museum-seattle/ They have an amazing youtube channel as well: https://www.youtube.com/c/connectionsmuseum