Have you ever wondered why when ever you walk into a bank to use the ATM and swipe your card to withdraw money where you need to type a 4-digit PIN code to authenticate yourself and proceed to withdraw money. However, have you ever thought what is the reason behind 4 digit code?

Why ATM PINs always have a 4 digit code?

ATM as we all know stands for Automated Teller Machine. It was first introduced in the year 1967 and it had been widespread in no-time.

ATM was invented by a well-known Britisher John Adrian Shepherd-Barron. He was born in Shillong and was born to Dorothy Barron (Wimbledon Ladies Double Champion). While testing his invention John Adrian Shepherd-Barron proposed for a 6-digit PIN.
The first person to use his latest invention was his wife, Caroline. Caroline apparently rejected the idea of using a six-digit PIN for her husband’s invention and the reason behind it was surprising.

Caroline rejected the idea of putting the 6-digit code for her husband’s invention just because she could only remember the largest string of 4-digits. So, 6-digit was too long for her to recall.

So, this was the reason why ATM PIN has only 4 digits. Nowadays there are many banks that are offering a 6-digit PIN code for accessing the Debit cards. However, sometimes we even forget our 4-digit code. Just imagine what can happen if the PIN was of 8 digits like we use it on our social media accounts. So, let’s thank that woman for making the code that short because 80% of us would forget it it it was the 6 digit as usual.

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that's a laugh, people have several phone numbers and password to diff site, all longer than 8digits and can still remember them.

[color=#000099][/color]Actually if u av a reasonable amount in ur account u can neva forget.....no matter d digits