During today’s iPhone 6s launch event, Apple announced the upcoming availability of iOS 9. The Cupertino giant will begin seeding the latest version of its mobile OS next week, on September 16. #Apple iOS 9 brings a host of improvement to the platform. They include improved, more proactive Siri, dedicated News app, and better multitasking among others. Most importantly, Apple iOS 9 will work with older Apple hardware. The list of compatible devices includes iPhone 4s and iPad 2.