zetigrek: It was famouse times when people where "refilling" their magnetic phone booth cards. They did that with a card writer. Once people figured out that it was just a value encoded on a magnetic strip card, all you needed was a writer.
Richfilth: The phone booth trick was to hold a recorder to the earpiece when you put in your money. back in the days of pulse-tone technology, the earpiece would play a small "blip" noise, which you could then play back down the microphone to trick the phone that you had paid. Blue boxes :) That's where the name for the magazine 2600 came from. It's a bit more complicated than tricking it into thinking that you paid, but not much.
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