Be careful about e-mails that offer credit services. Many unsolicited e-mails are fraudulent.
Don't leave your card lying around your home or office where others can see it, and never lend it to anyone.
Check your credit card bills as soon as they arrive. Follow the instructions on your bill for disputing charges and make copies of any letters sent to your credit card issuer.
Keep your account number and issuer's phone number handy in case your card is stolen. Keep them separately from your purse or wallet in case they're stolen too.
Tips courtesy: National Consumers League