iOS 27 is live in Australia. It rolled out this week. Apple says to do a pre-update check first. You should make a full backup. You should also review available capacity. The update introduces new features. Siri has been revamped. New system tools are added. Compatibility extends to iPhone 12 and later models. Recent iPads are compatible as well. Older devices like iPhone 11 are left out. Users are encouraged to prepare before updating. A backup is a good idea. Free space is needed. The rollout is happening now.