iPhone OS 2 (now known as iOS 2) was released on July 11, 2008. It was the second major release of Apple's iOS mobile operating system and included the introduction of the App Store, enabling third-party applications on the iPhone and iPod Touch for the first time. This release coincided with the launch of the iPhone 3G and was available as a free update for first-generation iPhones, while it cost $9.95 for iPod Touch users at the time due to accounting rules.