iPhone OS 2, the second major release of Apple's iOS operating system, was released on July 11, 2008, coinciding with the launch of the iPhone 3G. It introduced the App Store and supported third-party applications for the first time. The update was free for iPhone users but cost $9.95 for iPod Touch users initially.

If the question is about the upcoming or recent iOS versions instead of iPhone OS 2, for example iOS 18.2, it is expected to be released around mid-December 2024 based on Apple's typical release patterns.