Why won't my iPhone accept my credit card?

My iPhone won't let me download apps, even though I have a my debit card info all punched in. There's no money on my card, but I'm trying to download free apps. Can someone explain this to me? Is there a way around it?

I like iPhoneS

Goto itunes from a pc and remove cc info.

Not sure. You need to make separate itunes account and out no credit card on file and use that to download free apps.

It messes up this is why I hate iPhones my debit card has 30$ on it and it won't accept it won't even update coc

This is bad since my phone won't accept my debit card

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