In 2008, with the release of the iPhone OS 2.0 operating system, users were able to download applications via the App Store. Applications distributed by Apple must adhere to several restrictions, which has led to much controversy, as well as several groups developing unofficial software that can be installed on an iPhone via "jailbreaking." | In 2008, with the release of the iPhone OS 2.0 operating system, users were able to download applications via the App Store. Applications distributed by Apple must adhere to several restrictions, which has led to much controversy, as well as several groups developing unofficial software that can be installed on an iPhone via "jailbreaking." |