Apple has started rolling the new iOS 9 OS to all compatible Apple devices today. iOS 9 comes with interesting features and improvements. It is available for devices including iPhone 4S or later, iPad 2 or later, all versions of iPad mini or an iPod touch (5th or 6th generation).
You will receive the notification of the update, if you haven’t got the notification yet, go to Settings > General > Software Update option to download and install the iOS9 update to your Apple device. The update size is of 1 GB in size.
iOS9 comes with new Siri features and multitasking window. Another new thing i noticed is the search window added to home screen, to access swipe the screen to right and the first window is the search window. You can use the Siri to find out your desired things in your Apple device.
The iOS9 comes with new improved keyboard. Wallet app is also updated. I have also noticed two new icons, first one is the iPhone finder and 2nd one is the Find friends icon. Apple was also supposed to rollout the new watchOS 2.0 OS but due to a bug in development of watchOS 2 delayed its rollout.