Many iPhone users are facing the issue while downloading or updating the installed apps that iPhone is not updating or downloading apps because of billing information. Surprisingly the issue is occurring for free apps as well. While you make to install or update an existing apps the iPhone tells that the purchase is declined. Even when you have money in your account you may still see this error message while updating apps in iPhone. There is no clue that why iPhone is saying my method has been declined.
In case you are looking to update or download free apps, in that case you should try changing the payment type to NONE. Go to settings->iTuens&AppStore-> tap Apple ID (view Apple ID)->Tap payment information-> remove your payment information, select none.