For those who use the iTunes' App Store right from their iPhone, here are some ways to change your account settings without ever plugging in to your computer.
Logging in to the App Store on Your iPhone
Your iTunes App Store account is an important feature of your entire iPhone world. You provide sensitive financial information and this remains stagnant if you do not alter it in accordance with any changes in your situation. If you want to change some of your profile information in your iTunes App Store account you can easily do this directly from your iPhone.
iPhone App Store Settings
To change your App Store account information start by going to Settings on your iPhone. Go down to the third section of options, which has all of the iPhone applications that are built-in like Photos and Safari. Select the Store option from the bottom of this list. When you do this, you will be asked to sign in to view the account and this will happen even if you have already recently signed in to the App Store.
Once you select View Account you will be taken to a whole series of account information. This App Store account information will include your Apple ID, payment info, billing address, country, as well as your participation in iTunes offers.
If you want to begin changing your actual financial information, you will just go to the Billing Information and Billing Address. Just go ahead and press down on the piece of information that you want to alter and you will be taken to a more detailed informational input section where you can change the information.
If you select your credit card number, you will be taken to a credit card screen where you can change not only the number but also the expiration date, security code, card type, card name, card address and personal phone number. Once you have changed the information you select Done as you would with any settings changes on your iPhone. If you select the card number or the billing address you will go to the same edit menu.