iOS apps take up more space than advertised? I would like to download "RAGE HD" which the App Store says is "643 MB", but after clicking "BUY NOW" there is a message:


  There is not enough space to download "RAGE HD". Please delete some photos or videos.


But my "About" screen says I have "898 MB" available. How much extra space should I need to be able to download this game?
You have to take into account that the exact number is an approximated value and that the device needs additional space to install the application. I’m guessing that although the application says it’s 643Mb, it really uses some more when it gets installed. You’re really pushing the limits of your iOS there :)