iOS 9: The Basics

Whenever Apple debuts a new version of the iOS, the operating system for the iPhone and iPod touch, you have to figure out if your iPhone is compatible. Even if it is, you then have to decide if you should upgrade an older phone, since new software on old devices can be slow and buggy.

There are lots of new features and bug fixes in iOS 9. Plus, the upgrade supports more devices than in any previous release.

iOS 9 Compatible Devices

The Apple devices that are compatible with iOS 9 are:

iPhone	iPod touch	iPad
iPhone 6S series	6th generation iPod touch	iPad Pro
iPhone 6 series	5th generation iPod touch	iPad Air 2
iPhone SE		iPad Air
iPhone 5S		4th generation iPad
iPhone 5C		3rd generation iPad
iPhone 5		iPad 2
iPhone 4S		iPad mini 4
		iPad mini 3
		iPad mini 2
		iPad mini

Important New iOS 9 Features

This version largely focused on improving core functionality and the stability of the iOS. Many observers had said that was needed after the rapid pace of changes introduced in iOS 7 and iOS 8. Still, while generally well-received, some critics said iOS 9 delivered fewer major features than other versions of the iOS.

Among the major features introduced with iOS 9 were:

Features designed to understand the user's behaviors and proactively suggest tasks and features
Support for the 3D Touch screen on iPhone 6S series
Night Shift (in iOS 9.3 and up)
Low-Power Mode for extended battery life
Transit directions in Maps for selected cities
Numerous improvements to built-in apps
Interface changes on the iPad, including split-screen apps and picture-in-picture support for videos
Privacy and security improvements
Better support for older devices
Public beta program for early access to iOS updates.

Later iOS 9 Releases

Apple released 12 updates to iOS 9 after its debut. Every update maintained compatibility with all of the devices in the list above. Some updates added support for devices and features that hadn't been released when iOS 9.0 was first released. These include iOS 9.1, which added support for the iPad Pro, Apple Pencil, and Apple TV 4, and iOS 9.3, which added Night Shift and support for multiple Apple Watches being paired to the same iPhone.

For a deeper look at every version of the iOS, check out iPhone Firmware & iOS History.

What to Do If Your Device Isn't Compatible with iOS 9

If you don't see your device on this list, it can't run iOS 9. That may be disappointing, but don't despair: iOS 8 is a good operating system (or, it could be that your device is too new and it can only run later versions).

That said, if your device is so old that it's not supported here, you may want to think about upgrading. You're probably eligible for an upgrade, so shop around. You might be able to get a great deal and some slick new hardware. Just make sure to check when the next model is coming out so that you don't buy just before something new is released.