BANKING GENERAL KNOWLEDGE
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Detailed explanation-1: -As you already know, in order to use such cards in ATMs or at POS (point of sale) terminals in grocery stores or supermarkets, you have to authenticate it using a unique 4-digit number known as a PIN (Personal Identification Number).
Detailed explanation-2: -PIN (Personal Identification Number) is a 4-digit code unique to each ATM card that ensures that the card user or account holder is carrying out the transactions. You cannot use the ATM card without activating the PIN.
Detailed explanation-3: -Your PIN is the last 4 digits of your PHONE number.
Detailed explanation-4: -Mr Shepherd-Barron came up with the idea when he realised that he could remember his six-figure army number. But he decided to check that with his wife, Caroline. “Over the kitchen table, she said she could only remember four figures, so because of her, four figures became the world standard, ” he laughs.