How can I add an icon to an iPhone application?

Question

Will simply putting an image into the project folder do it?

Answer 1

1. Create your image sized 57x57 pixels (for iPhone).
2. Name it Icon.png (you can change this name in Info.plist)
3. Add it to the Resources folder in Xcode.

That should get you started and there are more details here. You may also want to add a smaller icon for the Settings app (29x29 called Icon-settings.png).

Answer 2

Apple iPhone Human Interface Guidelines:

Name your icon file Icon.png and place it at the top level of your application bundle.