this post was submitted on 31 Aug 2023
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It never really was secure. You could always set the Caller ID on an outgoing PRI trunk to whatever you wanted with any of the phone systems in the last half century. It isn't validated.
Also phone phreaking existed. Just blow a whistle into the pay phone and get free calls.
I had a little touchtone dial pad I could put up to the mouthpiece and dial through with. It was sweet
It was when you had to ask the nice lady to connect you. That's what happens when you remove all the infrastructure jobs.