All you need is “iPhoney”, which is a free iPhone Web simulator for designers.
iPhoney gives you a pixel-accurate web browsing environment—powered by Safari—that you can use when developing web sites for iPhone. It’s the perfect 320 by 480-pixel canvas for your iPhone development. And it’s free.
iPhoney currently is only available for Mac OS. However the latest 1.1 version has become open source, so ports to other environments should be expected soon.
Download (1.4 MB)