If you're on Orange, some good news for you. They have opened up a new gateway for all your app, game and music purchases in the Windows Phone Marketplace. You can now choose between your account credit card and your Orange phone bill.
While this is a fantastic new way to easily populate your internal storage, we recommend caution - try not to go overboard or you'll receive a nasty surprise at the end of your contracted month. Are you on Orange, and are you interested in using your monthly bill to pay for apps etc.?