How to purchase a free app on my IPhone without having to use a credit or debit card?

I recently tried purchasing a free app and it told me I had to update my card info due to the fact that my last purchase over Drew my account. So it wants me to add another card. Well first of all I shouldn't need a card to purchase a free app, and secondly when I first got the phone I downloaded a lot of free apps and I had no card on file. I only put the card on a couple of months ago to buy a song. Anyways, is there anyway around this or anything I can do to the phone?

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That needs apps like iFunbox to help you install. The easier way to do it is with KuaiYong an PC app installer that installs both free and paid apps. It is currently only available in Chinese but it there are lots of tutorials explaining and it is quite self explanatory.

http://kickass.to/kuaiyong-2013-beta-…

You don't actually have to put a credit card, just some info, and thats it