Here is a list of the versions of iOS and some of the major features and improvements introduced in each release, as well as the devices that support each version:
iOS 1
Release on June 29, 2007. This was the first version of iOS and was only available on the original iPhone. It introduce a new user interface, support for multi-touch gestures. And support for mobile applications.
iOS 2
Release on July 11, 2008. This version introduce the App Store, introduce support for third-party applications. And introduce MobileMe.
iOS 3
Release on June 17, 2009. This version introduce support for copy and paste, introduced MMS support. And introduce support for tethering.
iOS 4
Release on June 21, 2010. This version introduce support for multitasking, introduced FaceTime. And introduce iBooks.
iOS 5
Release on October 12, 2011. This version introduce support for iCloud, introduce iMessage. And introduce the Notification Center.
iOS 6
Release on September 19, 2012. This version introduce support for Apple Maps, introduced Passbook. And introduce FaceTime over cellular.
iOS 7
Release on September 18, 2013. This version introduce a redesigne user interface, introduced Control Center. And introduce AirDrop.
iOS 8
Release on September 17, 2014. This version introduce support for third-party keyboards, introduce iCloud Drive. And introduce Health.
iOS 9
Release on September 16, 2015. This version introduce support for split-screen multitasking, introduce Proactive Assistant. And introduce News.
iOS 10
Release on September 13, 2016. This version introduce a redesigne Lock screen and Control Center. introduce Home, and introduce the Messages App Store.
iOS 11
Release on September 19, 2017. This version introduce support for ARKit, introduce the Files app. And introduce the redesign App Store.
iOS 12
Release on September 17, 2018. This version introduce support for ARKit 2, introduce Screen Time. And introduce Siri Shortcuts.
iOS 13
Release on September 19, 2019. This version introduce a redesigne user interface, introduce Dark Mode. And introduced Sign in with Apple.
iOS 14
Release on September 16, 2020. This version introduce a redesigne home screen, introduce App Library. And introduce widgets.
iOS 15
Release on September 14, 2021. This version introduce a redesigne notification center, introduce Focus mode. And introduce Live Text.
iOS 16
Release on September 20, 2022. This version introduce a redesigne Control Center, introduce App Library on the home screen. And introduced App Clips.
iOS is only available on Apple’s iPhone, iPad, and iPod Touch devices. To check which version of iOS your device is running, go to the Settings app, tap “General”, and tap “Software Update”. This will check for any available updates and show you the current version of iOS that is installed on your device. If an update is available, you can install it by following the on-screen prompts.