The iOS jailbreak community has a new development to follow. Calif has reportedly demonstrated an untethered jailbreak on an iPhone 18 Pro running iOS 27.0.1, bringing renewed attention to jailbreak possibilities on Apple’s latest devices.
According to the original report, the demonstration took place at Hexacon 2026 in Paris. The reported achievement is particularly noteworthy because an untethered jailbreak can maintain its modified state even after the device restarts.
How Does the Untethered Jailbreak Work?
Unlike traditional tethered jailbreak methods, which may require a computer after a reboot, an untethered jailbreak is designed to remain active across restarts without requiring the user to repeat the activation process.
The reported Calif demonstration showed progress toward achieving this capability on the iPhone 18 Pro. The researchers also reportedly demonstrated root-level access, an important aspect of gaining deeper control over the iOS operating system.
If a compatible tool eventually becomes available, this type of jailbreak could offer opportunities for advanced customization, additional system modifications, and third-party tweaks that are not normally supported by Apple.
Can You Jailbreak iOS 27.0.1 Right Now?
Despite the promising news, users should understand that a research demonstration and a public jailbreak release are two different things.
There is currently no confirmed public download link or verified installation procedure established by the report. The demonstration also does not confirm that the same technique works across all iOS 27 versions or iPhone models.
For now, users running iOS 27.0.1 should avoid downloading files advertised as the official Calif jailbreak unless the developers publish and verify a legitimate release.
Will Other iPhones Support This Jailbreak?
The reported demonstration focuses on the iPhone 18 Pro running iOS 27.0.1. It should not be interpreted as confirmation that the iPhone 18 Pro Max, other iPhone 18 models, or older devices are supported.
Jailbreak compatibility depends on the vulnerabilities involved, the device’s hardware, and the installed firmware version. Further technical details and testing will be needed to establish the full range of supported devices.
Stay updated: We will continue to monitor this development as more information becomes available. Until a verified release is published, treat the Calif demonstration as a research milestone rather than a ready-to-install jailbreak.