10 Things to Know About the iPhone 5s iOS 9 Update

You Can Downgrade Your iPhone 5s to iOS 8

If you want to test out the iOS 9 update, you can. 

Apple's still signing off on the iOS 8.4.1 update. This means that you can drop back down to iOS 8.4.1 if you decide that the iPhone 5 iOS 9 update isn't what you want. The downgrade loop hole is typically open for a week or two after release so you'll need to make your decision soon.

For more on how to downgrade from iOS 9 to iOS 8.4.1, take a look at our step-by-step guide. Even if you don't end up doing it, you should become familiar so that you're prepared for future iOS updates from Apple.