Your card number is carefully structured. The very first digit is what’s known as the major industry identifier. A 4 means ...

The digits mattered because rotary telephones require longer rotations to enter “0” and other small numbers. The most populated regions, such as California, were assigned the area codes that ...

A postal code is a five digit code used to help postal services deliver mail and packages. Here's what the numbers mean and how they determine yours.

ST. LOUIS, Mo. – The deadline is Sunday to start dialing all ten digits in phone numbers. Starting October 24, anyone dialing local numbers should dial the area code and the telephone number.… ...