There are some rather large applications available for iOS devices (iPhones, iPads, and the iPod touch). You may know that larger applications won't download nukes you're connected via WiFi, however, what do you do if you need to leave your WiFi coverage in the midst of a download? Just tap the app's icon and that'll pause the download. You can tell the download is paused because it says so right under the app's icon (see the image to the right).
Tap it again to resume when you're once again embraced by the welcoming arms of WiFi.
