iOS 27 is live in Australia. It arrived this week. Apple says to do a pre-update check first. You should save your important files. You should also check storage space. The update adds new features. Siri has been revamped. New system tools are added. Compatibility includes iPhone 12 and later models. Recent iPads work too. Older devices like iPhone 11 do not qualify. Users are told to prepare before updating. A backup is a good idea. Free space is required. The rollout is being released.