The big day has arrived: iOS 9 is now available for download.

After months of public beta releases, Apple officially pushed out its latest mobile operating system for iOS devices on Wednesday. While may users saw download failures and error messages out of the gate, most issues seemed to be resolved within the first hour of its release.

The easiest way to update your iPhone, iPad or iPod touch to iOS 9 is to go to Settings > General > Software Update and download it over-the-air (OTA). If you go this route, you will need to connect to a Wi-Fi network as the update is too large to download over a cellular connection (even if you do have enough data).

Alternatively, you can also connect your supported iOS device to your PC or Mac and update through iTunes.

iOS 9 is compatible with the following devices:
• iPhone: iPhone 4S, iPhone 5, iPhone 5C, iPhone 5S, iPhone 6, iPhone 6 Plus
• iPad: iPad 2, iPad 3, iPad 4, iPad Air 2, iPad mini, iPad mini 2, iPad mini 3
• iPod touch: iPod touch (fifth-generation)

As always, we recommend backing up your data with iCloud or to a computer via iTunes beforehand, to prevent any accidental data loss during the update process.

iOS 9 weighs in at 1.8GB, so it’s best to make sure you have enough storage to download the update. If you find yourself lacking storage, now’s a good time to look through all of your apps and delete the ones you don’t use or use very infrequently; start with games and videos as these usually take up the most storage.

iOS 9 brings with it a list of new improvements, including but not limited to improved battery life and a power savings mode, search suggestions, a smarter and more contextual Siri, and public transit directions in the Maps app. You can learn more about all of the new features in iOS 9 here.

Author: Raymond Wong
Source: Mashable