Have you ever purchased an App, then deleted it and for whatever reason needed that App again? Well, some may not be aware of this, but you can simply go back to the App Store and download the App again. You will not be charged as iTunes will recognize that it’s an App that is already registered to your account. You hit the download button as you normally would, and you will get a message telling you that the item has already been purchased and “To download it again for free, select OK.”
Many may know this, but the App Store never makes it clear whether or not you have to pay for the application a second time before you try to make the purchase.