Apps wont download..

I cant seem to download any Apps, it brings me to my itunes account,
I have a credit card (mastercard) and im filling everything it tells me to, but once i click "Ok/Done" it says "invalid Security Code", but im using the right card/number, its the 3digits on the back of card
whats wrong?..this may be the wrong Category for this but i cant find where i should post this
i tried doing this on my laptop and Ipod, nothing seems to work
it isnt fun if you cant download any Apps..


Oh. A used device. You didn't say that.
Look at Options > Security > General Settings, scroll to the bottom at **services** is any policy named there?
Or it could be at Options > Security > Information.
What do you see?
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