It was in October of 1983 that I bombarded a phone switch using modem tones in a very small town (500 people) in upstate New York. My phone quit working that evening. It was still dead the next morning. As a matter of fact, so was every other phone in town, including the PBX where I worked. No one could call the phone company to report the outage.
I hope the statute of limitations is up.
Try that now and you'll find yourself squatting in a Tiger Cage in Guantanamo Bay!