hi can you tell me why i can not add my credit card
will not let me add my credit card to my apple acc
iPhone 4S, iOS 7
We are fellow users here on these forums, you're not talking to iTunes Support nor Apple.
If you are getting a message about the card's security code, as on the TS1646 page that you posted from, then you've double-checked your card's details and you have exactly the same name address (including format and spacing) on your iTunes account as the card is registered to ? If you do then you've checked with your card issuer ?