<i>The application has not been approved because, as submitted for review, it appears to alter the iPhone’s distinctive user experience by replacing the iPhone’s core mobile telephone functionality and Apple user interface with its own user interface for telephone calls, text messaging and voicemail.</i> -- <a href="http://www.apple.com/hotnews/apple-answers-fcc-questions/" rel="nofollow">http://www.apple.com/hotnews/apple-answers-fcc-questions/</a>