In the past I've fallen for the ad on TV saying you can get a free credit report. In order to get that report you have to provide a credit card number for a trial membership in that organization. I forgot to cancel my membership and after 30 days, I started getting a monthly charge on my credit card!! Luckily, they reversed the charges when I called but this is a very misleading ad.
You can actually get a free credit report through this official site www.annualcreditreport.com. It is sponsored by the three major credit reporting agencies and it is free.