Hilarious. As a teen I knew that sequence sounded exactly like MF signaling one would expect on an international call. It was common knowledge of high school hackers that it had recently been straightforward to use a "blue box" to make free calls using that kind of tone but that it was quite difficult by 1985 or so to find places in the network where it would work inside CONUS.
(Phreakers in the late 1980s were frequently "carders" who stole MCI account numbers by methods such as systematic dialing, not to mention my favorite tactic of taking over an answering machine to change the message to "this number accepts all third party and collect calls" which will strike terror into a dentist office or church or other victim when they find out)
(Phreakers in the late 1980s were frequently "carders" who stole MCI account numbers by methods such as systematic dialing, not to mention my favorite tactic of taking over an answering machine to change the message to "this number accepts all third party and collect calls" which will strike terror into a dentist office or church or other victim when they find out)