Here's a fun fact: in the photo of the Byte Shop, the person in the window with their back to the camera is John Draper, the legendary hacker known as Captain Crunch.
You might like Evan Doorbell's YT channel then – he has a lot of old tapes from his misspent youth traveling the world on Ma Bell's dime, and has posted a lot of videos explaining it all for a generation (like mine) without any frame of reference.
Evan's stuff is excellent and worth watching/listening to.
Shameless plug: if you like his stuff, you might also like my book, "Exploding The Phone", which is a history of phone phreaking. https://explodingthephone.com/
My uncle is Paul Terrell, the owner of that Byte Shop. He showed me the photo and told me who was in the window. But I don't have an independent verification of this -- dunno, maybe Captain Crunch is a lurker here?