Downloading Applications

When you find an application you want in the App Store, you can purchase and download it to iPhone. If the application is free, you can download it without charge after providing your iTunes account information.
Once you download an application, it is immediately installed on iPhone.
Purchase and download an application:
Tap the price (or tap Free), then tap Buy Now.
If you were signed in to your iTunes Store account in iTunes the last time you synced iPhone, you don’t have to enter your account ID. Otherwise, you are prompted to enter your account ID.
Enter your password and tap OK.
Downloads for purchase are charged to your iTunes Store account. For additional downloads made within the next fifteen minutes, you don’t have to enter your password again.
See the status of downloading applications:
After you begin downloading an application, its icon appears on your Home screen and shows the status of the download and installation.
If you need to turn off iPhone or leave the area of your network connection, it’s okay to interrupt the download. iPhone starts the download again the next time iPhone joins a network with an Internet connection.