IOS 9

iOS 9 is the ninth release of the iOS mobile operating system designed by Apple Inc. as the successor to iOS 8. It was announced at the company's Worldwide Developers Conference 2015 on June 8, 2015, and was released on September 16, 2015. iOS 9 focuses less on new features and more on under-the-hood optimizations, as well as battery improvements. iOS 9 only requires over 1 GB or iPhone or iPad space to download.

History
OS 9 debuted at Apple's Worldwide Developers Conference on June 8, 2015, with iOS 9.0 beta 1 being made available to registered developers straight after the keynote, and a public beta made available to members of Apple's Beta Software Program in July. iOS 9 was released publicly on September 16, 2015.

iPhone

 * iPhone 4S
 * iPhone 5
 * iPhone 5C
 * iPhone 5S
 * iPhone 6
 * iPhone 6 Plus
 * iPhone 6s
 * iPhone 6s Plus

iPad

 * iPad 2
 * iPad_(3rd_Generation)
 * iPad_(4th_generation)
 * iPad Air,
 * iPad Air 2
 * iPad Pro

iPad Mini

 * iPad Mini
 * iPad Mini 2
 * iPad Mini 3
 * iPad Mini 4

iPod

 * iPod Touch (5th generation)
 * iPod Touch (6th generation)
 * NOTE: The IPhone 2g and 3G And 3GS And 4 Are Not Supported And The IPhone 4S Is No Longer Making Updates Anymore And Its With The Support.

Trivia

 * This Is The Last IOS To Feature Slide To Unlock.
 * This Is The First IOS To Use A New Flat Music Icon.
 * This Is he First IOS To Feature A New Flat Switcher.
 * This Is The First IOS To Feature News Becuase The Newsstand Name Has Removed And News Is Now A Name And Not Stand At The End Of The Name.
 * The Original Flat Music Icon Was Going To Be In IOS 9 Beta Only.