After the launch of iPhone 6s and 6s Plus, Apple has finally planned to seed iOS 9. Apple will start seeding the next mobile OS next week on September 16.Apple iOS 9 comes with a lot of improvements to the platform. This includes a devoted News App, a better and proactive Siri, and enhanced multitasking including many.

iOS9 will start seeding on September 16, 2015

More significantly, the new OS is workable with Apple older devices. There is list that includes both iPhone 4s and iPad 2.