Keep an eye out for pickpockets. Always check your card when you get it back in a restaurant or store. It's easy for waiters or salespeople in a rush to give you the wrong one. At home, keep all cards you don't carry with you in a safe place that won't be obvious to burglars. Always sign your card in ink as soon as you receive it.
Merchants can check the card's signature against the signature on the receipt.
Keep in mind that when you add the names of other people, such as your children, to your credit card account, you will be held responsible for any of the charges that they make. Never lend your card to anyone. If you want to put someone else's purchases on your card, handle the transaction over the phone, or go to the store yourself. Your credit cards should always stay with you. Keep track of when new and reissued cards are due to arrive, and call the credit card issuer if they don't come on time.