How to setup normal Icon for iPhone3 and Retina for iPhone 4

Question

I heard somewhere of an workaround by adding the following files to your xcode project:

• Icon.png - 57x57 pixels application icon for standard resolution iPhone

Answer 1

See Apple's Technical Q&A QA1686 which describes the exact naming conventions, Info.plist keys, and other details for the various icon sizes required for each device.