I can't download notfree apps. Help.

If i try to write card security number, and click "Done", then red window says "Enter Valid security code".
But code is VALID!!!!

Under normal circumatances, when you create an Apple ID on your computer iTunes, you input credit card number, expiry date and security code.  Then when you activate your mobile device with the same id, it will ask you to verify security code of your credit card.
However, more often you may have a renewal card with new expiry date and different security code, you will have to update it on your iTunes account and verifiy again through your mobile device.
If the above deos not solve your problem, please contact Apple Support direct:
http://www.apple.com/support/appleid/contact/

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