iPhone Duo jailbroken on launch day

Just hours after being released, an iPhone Duo running iOS 27.1 has been jailbroken by hacker team Calif.

Calif demonstrated the ‌iPhone Duo‌'s icons and widgets bouncing around, and added an anime character to the device's screen.

Last week, the group shared videos featuring an untethered jailbreak on an iPhone 18 Pro running iOS 27.0.1. The device was shown rebooting, with root access available after the reboot.

CC @pwnlambda https://t.co/xpwddwn7tw — Calif (@calif_io) October 23, 2026

Calif has not publicly released the jailbreak. Calif security researcher Stefan Esser told German site Heise that there won't be a jailbreak tool available for "end users," but a proof of concept may be forthcoming.

Esser said the iOS 27.0.1 jailbreak used bugs Calif has already disclosed or plans to disclose to Apple soon, and "most" of the vulnerabilities are fixed in the upcoming iOS 27.2 update. AI was used to help develop the jailbreak, but Esser didn't explain how.