Downloading free apps.
Do you actually have to have a credit card to download free apps?
iPhone 4S, iOS 5.1
Do you actually have to have a credit card to download free apps?
iPhone 4S, iOS 5.1
Check the Apple article below.
Creating iTunes Store, App Store, iBookstore, Mac App Store account w/o a credit card
First thing you should do is select an app to download, then follow the instructions in the above link.
Downloading free apps.