Quit App (restart app)

You can fully quit the app by tapping the iPhone Home button. If you're running iOS 4 and your phone is an iPhone 4 or 3GS, after you tap the Home button, you also need to remove the app from the list of recently used apps. If you're not familiar with the concept of removing an app from the list of recently used apps, here's a web page from Apple that explains the process:

http://support.apple.com/kb/ht5137