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nradov
on Jan 5, 2012
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Why Don’t Smartphones Have A “Guest Mode”?
It's a nice idea but wouldn't work in practice. If the "help" PIN is always 1 higher then there would be too many false alarms due to pressing the wrong button. Or if the "help" PIN is totally different then victims will forget under stress.
jmonegro
on Jan 5, 2012
[–]
Also, robbers would know there is such thing as a "help" pin, therefore rendering it useless. It's not a good idea in practice.
Angostura
on Jan 5, 2012
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It wouldn't render it useless if the behaviour of the machine was identical (other that sending a silent alert) and still dispensed the cash.
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