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

You’re at the checkout screen after an online shopping spree, ready to enter your credit card number. You type it in and instantly see a red error message ...

UPDATE (Jan. 8): East Tennessee will soon have another new area code, and it's going to add three more digits to many people's local calls. The Tennessee Public Utility Commission also said that due ...