As shown earlier, the application installed on your iPhone Simulator uses a default white image as an icon. You can, however, customize this icon. When designing icons for your iPhone and iPad applications, bear the following in mind:
NOTE Apple has published a description of the various images that you can use in your iPhone application. For details, see http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/mobilehig/IconsImages/IconsImages.html.
The following Try It Out demonstrates how to add an icon to your application so that the iPhone will use it instead of the default white image.
TRY IT OUT: Adding an Icon to the Application