Yes, there have been successful attempts at developing an iPhone app for OSSN. Several developers have created apps that integrate with OSSN and provide mobile access to its features and functionalities. These apps can be found on the App Store and are used by OSSN users to access their accounts and interact with the platform on their iPhones. Mayo Clinic Patient Portal
Visit OSSN's official website, forums, or community platforms to see if any announcements or discussions have taken place regarding the development of an iPhone app. If there's an active community, you might find information there.