If you are planning to create a iPhone application or maybe a iPhone optimized website, you probably would like to see how it will look like before you create it. This free iPhone 4 GUI Photoshop file “20 MB” helps you create a professional app design without any programming skills. It includes all the icons and buttons you need and is in high resolution, specially for the iPhone 4. You can download this Photoshop file at teehanlax for free but they do except donations.