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I saw video "do that if you are forced to enter your card PIN" where they tell you to enter your PIN backwards, which will allegedly be accepted as a usual PIN, but additionally notify authorities.

Unfortunately none of the banks I was client of did that

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I think that's an urban legend. it appears to work sometimes as some ATMs don't do anything with the provided pin until you get further in the transaction. A surprising number of ATMs also do "offline" verification, where the card itself is the only thing validating the pin and the transaction is send back to the card processor later.

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