You can check the Downloads screen to see the status of in-progress and scheduled downloads, including purchases you’ve pre-ordered.
Tap Downloads.
To pause a download, tap
.
If a download is interrupted, iPhone starts the download again the next time it has an Internet connection. Or, if you open iTunes on your computer, iTunes completes the download to your iTunes library (if your computer is connected to the Internet and signed in to the same iTunes account).
Tap Downloads.
Pre-ordered items appear in a list until the date the item is released. Tap the item for release date information. Once the item is available for download, a download
icon appears next to the download.
Tap the item, then tap
.
Pre-ordered items don’t download automatically when they’re released. Return to the Downloads screen to begin the download.