Can't download apps without apple asking for my credit card?

I just got a new iphone 4s and made a new apple ID. I have logged in but when i press download on FREE apps it says parts of my information are left out and enter a credit card number?
and i don't want a credit card and i can't download any apps

There's a "none" option on the credit card area, choose that, but you have to fill out your other information and click the agreement button.