How to use my iTunes gift card without having to verify my billing information?

I just got the iPhone 5. Prior to this, I had the iPhone 4 and I accessed my iTunes account from that. Then I started using my iTunes account from my dad's computer. Out of the blue, it started telling me that I couldn't even download a free app without verifying my billing information. I tried doing this, but the security code on my dad's card wouldn't work. Shouldn't I be able to use my gift card without having to verify my billing information?

Go to your billing information on itunes and select none for credit card

They require a credit card as a back up even if you only download the free apps.once you enter a valid CC number, you'll be able to use your gift card

  • Why does the App Store want to know my billing information if the app is free? On my iPhone 4s, I try to download an app from the app store, first it'll ask for my password which is normal, and I put it all in correct but then it'll redirect me to my billing information/payment method and ask me to fill it out. I can't remember what my prepaid security number is because I haven't had it in so long so I can't do it. But the apps I try to download are completely free so I don't understand why this would happen. Is there anyway to fix this?
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