You can pause an app download or update by simply tapping the application’s icon once the download process begins. Tapping the app icon again resumes the download, and paused downloads are easy to spot because they all show “Paused” instead of the application name.
Pause app downloads by tapping the application’s icon.
This is a handy way to prioritize downloads and updates when you’re facing a time crunch, or dealing with slow 3G or EDGE data speeds — and it doesn’t require any special hacks to work.