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There was a time in the early 90's when you could make a long distance call from a residential number and get AT&T to bill it to a third number without their consent. I guess the idea was that if there was a dispute they would go after whoever originated the call. What they didn't account for was the rise of COCOTS or Customer Owned Coin Operated Telephones, which were payphones connected to normal lines where all of the security was local instead of at the telephone company office. Long story short you could make long distance calls from a lot of payphones and bill them to random strangers.