Designing an iPhone app? Ditch the wireframes
You don't need extensive wireframes for iPhone apps. Get a solid site map and page flows together, and jump straight into design, you'll be OK (I promise)
Since phones have a pretty limited UI palette, it makes more sense to start with the end. Design your high-res button elements, fonts, icons and menu bars. Then just start throwing it together, you'll find all you need to know in the process of actually designing something that looks close(r) to the final product. Read more