Apple App Store won't allow me to download any apps

On my iPhone 4 I'm trying to download free apps and it the app store won't allow me to. It asked for my billing information. Which I don't understand since its free. But I put in the card number and it kept telling me invalid security code. When it was the correct code.So, I tried another card and same problem. This has been going on for about 3 weeks now and it's really starting to piss me off. Any suggestions or help! Please and thank you.

Have you set up an account? Do you log in to the account when trying to purchase?

Try creating another Apple ID on iTunes and when it brings you to the billing info select the option for "none". That means there won't be any credit/debit cards on the account and no paypal. You'll get free apps. If that doesn't work, try restoring to iOS 5.1.1.

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