Give your account number over the phone, unless you have made a call to a company you trust. If you have a question regarding a company, check it out with your local consumer protection office.
Report Losses and Fraud
If your card is stolen or lost, report this immediately to the issuer immediately. Many companies have free emergency numbers specifically for such calls. By law, you have no further responsibility for unauthorized charges once you have reported it. Calling quickly will reduce your liability for unauthorised charges, and will help the card issuer to catch the fraudster or block the transactions, making life harder for the crooks.
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Joseph Kenny is the webmaster of the UK credit card comparison site www.creditcards121.com/, where you can find a selection of credit card advice that should help guide you through the credit card maze. For US visitors there is also the comparison site www.credit-cards-info.com/ for all US interest free offers.