How to delete billing information?
I recently purchased some apps from app store in my iPhone 5. Now I want to delete my credit card information. It's a visa credit card. I can't even update free apps. Whenever I want to update apps, it asks me to view my billing information and it asks me to submit my informations again. And I can't delete my card number and and there are no choices for Payment Type except Visa, Mastercard and Amex. Please help me out with this. Thanks.
iPhone 5, iOS 6.1.4