(at around 48 mins) When Lecter is given the phone, he punches the button in the cradle in a sequence, dialing area code 312, which would be for a number in downtown Chicago. This trick worked on pre-digital phones. It replicates what happens when a telephone dial is turned. When you put your finger in the hole for a specific digit, pull it round to the stop, then release it, the spring turns the dial back, creating one click for each digit as it passes. As the number 0 is the last in the sequence, it clicks ten times. Upon the arrival of touch-tone phones, wiz kids such as a young Steve Wozniak, who co-founded Apple, could build boxes to generate the tones, making phone calls for free. The phone company later changed this to prevent such things.

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