Immediately report lost or stolen cards to the credit card company. If you report the theft early, you won't have to pay the thief's credit card bills. In addition, the credit card company can stop the thief by canceling your credit card number. A thief doesn't need your credit card to charge merchandise to your account. He or she only needs your credit card number.
Criminals use stolen credit card numbers to make purchases over the phone or through the mail.
Sophisticated lawbreakers can even make a new credit card with your name and number on it. Someone might be looking over your shoulder to copy your number. Keep track of your credit card receipts. These receipts can reveal your credit card number to anyone one who finds them. Don't give your credit card number to a telemarketer unless you are sure he or she represents a reputable company or you placed the call.