I found a copy of the original article; will have to re-read it for nostalgia sake:

https://www.ckts.info/downloads/articles/Esquire%20Magazine%20October%201971%20-%20Secrets%20Of%20The%20Little%20Blue%20Box.pdf

At the time, I didn't have the tech bones to actually build a Blue Box, so I hacked some whistles to the appropriate frequencies in order to fiddle around. Never did succeed at placing an international phone call, but I had a lot of fun and learned a lot about the global phone system.🤔🧐😜😆

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