The version history of the mobile operating system iOS, developed by Apple Inc., began with the release of iPhone OS for the original iPhone on June 29, 2007. Since its initial release, it has been used as the operating system for iPhone, iPad, iPod Touch, and HomePod, seeing continuous development since then, resulting in new major releases of the software typically being announced at the annual Apple Worldwide Developers Conference and later released in September, coinciding with the release of new iPhone models. Starting with the 13.0 release, the operating system for iPad was split off as iPadOS. The latest stable version of iOS and iPadOS, 15.0.2, was released on October 11, 2021. The latest beta version of iOS and iPadOS, 15.1 beta 4, was released on October 13, 2021. Updates can be done over-the-air through settings (since iOS 5), or via the iTunes or Finder applications.As of 2021, Apple updated iPhones that were up to seven years old with the latest software versions.