Tip: Memorize one your credit card numbers

The small time investment of memorizing the number of one of your credit cards, along with the expiration date and security code, is well worth it.

You'll save time when buying stuff online and on the phone.

Plus, there is a slight security advantage. At some point, you'll be buying something on the phone while you are on the go, and knowing the number means you won't have to pull your credit card out of your wallet while you are walking along and carrying a couple packages, with the chance of dropping or losing your card.

You don't need to remember phone numbers any more. A credit card is one number worth knowing.