Why is my itunes saying my Prepaid debit card Security code is invalid when its right? Anyone know?

You can't use a pre-paid debit card with iTunes. There is no way to verify the billing address on those cards as there is no billing address in the Visa/MasterCard system for them. Buy an iTunes gift card and put that on your account instead.

I'm having the same problem too, except I already put my prepaid debit card on my account and got it to work, and now it's saying my security code is invalid and won't let me remove my card. Your prepaid debit card might be out of money, OR, if you have a AMEX card, the security code is actually the 4 digit number on the front of the card, not the back. If none of those work and you still have money in the card you should just go and buy an iTunes gift card with your prepaid card. Hope this helped!

There IS a billing address for some pre-paid cards. Greendot has a personalized card, which I have and have been using over a year. It uses MY billing address and has MY name on the card. I can log into greendot.com and check balance/transactions/transfer money just like a bank account. Greendot owns its own bank.