Creating a wireframe for your iPhone app is a great way to ensure developers and graphic designers fully understand your app and how it should work.
A great tool for creating awesome wireframes is Balsamiq Mockup for Desktop. Balsamiq's software is perfect for the job and so easy to use because it's specifically designed to create wireframes for websites, computer software, and iPhone apps of course.
If that's not enough, they even have a feature that lets you turn your wireframe into a prototype for your iPhone app so you and developers can actually experience the flow of the app.
Below is a link to the Balsamiq website, check it out for free:
I DO NOT earn an affiliate commision if you go to this link . I just really like this tool and wanted to share the love.