How to delete credit card information from IPhone4?

I put my pre paid credit card information on my IPhone once to buy an add and naw i can't get it off and i can naw not download anything at all on my phon it don't matter if it is free or not it wants my credit card information everytime and if i not give it or nothing on card it don't work and in my account setting the options "None" is not there to remove my credit card information (So please don't sat selete none)… And also i not want to reset the whole phone cuz my phone is jail broke and don't wanna loose all my numbers… Thank you

Go the customer care service. They can help you more than anyone. This will be the best suggestion in my idea.

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