IOS 8

iOS 8 is the eighth major release of the iOS , designed and distributed by Apple as the successor to iOS 7 and the predecessor to iOS 9. It was announced at WWDC 2014 alongside watchOS 1 and OS X Yosemite. It features new compatibilty with OS X 10.10 "Yosemite" such as enabling Macintosh computers to intercept calls from your iPhone and be used to talk to the caller.

New features

 * Siri can be invoked with "Hey Siri" from an Apple device plugged in to power.
 * HomeKit for automating smart-home devices.
 * HealthKit for health tracking.
 * Updated iCloud with support for iCloud Drive and iCloud Photo Library.
 * Family Sharing.

Supported devices
iOS 8 was released on Wednesday September 17, 2014. It is compatible with:
 * iPhone 4S, iPhone 5, iPhone 5C, iPhone 5S, iPhone 6, iPhone 6 Plus
 * iPod touch (5th generation)
 * iPad 2, iPad (3rd Generation), iPad (4th generation)
 * iPad mini, iPad mini 2
 * iPad Air, iPad Air 2

Trivia

 * This is the first iOS to feature Apple Watch and Health.
 * This is the last iOS to use the original flat Music icon and the first iOS to use the new flat Music icon.
 * This is the last iOS to use the original flat Newsstand icon app.
 * This is the only iOS to update Passbook and the last to be used on iOS 8.