iPhone Duo Lock Flaw Leaves Devices Vulnerable

Apple's first foldable smartphone, the iPhone Duo, has run into a serious security vulnerability that can leave the device unlocked and exposed. The issue allows unauthorized access to the handset even while the lock icon remains visible, and the latest iOS 27.1 build does not fix the problem.

According to tech publication IT Home, blogger VictoryWenZouZou uncovered the flaw during real world use of the phone. The creator noticed that the fingerprint unlock response felt unusually slow. By repeatedly triggering the scanner, the user was able to overload the system, causing the scanner to stop responding properly.

Once the biometric mechanism freezes, touching the screen can unlock the handset without any fingerprint authentication or screen swiping. The device displays the normal locked status icon, yet the user gains entry to the home screen. Because this behavior bypasses security safeguards, the blogger advised owners to avoid relying on the fingerprint sensor until Apple releases a software patch.

Launch Troubles for Apple's First Foldable

The fingerprint flaw is not the only software headache hitting the debut of the iPhone Duo. Cybersecurity firm Calif.io published a video demonstration on social platform X showing that researchers achieved a successful jailbreak on iOS 27.1 during the first day the foldable hit store shelves.

Early buyers have also expressed frustration with biometric hardware choices. Apple decided against adding Face ID on this model, leaving fingerprint recognition as the primary biometric option for buyers.

Future Hardware Plans

Hardware adjustments may already be in the works for future iterations. Bloomberg reporter Mark Gurman reported that Apple is currently testing a second generation foldable prototype that restores facial recognition. In these test units, Apple integrated the Face ID sensor beneath the outer glass cover.

For current buyers, this lock vulnerability presents an immediate privacy risk. When basic device locking fails silently, personal data and account access remain open to anyone nearby. Apple will need to address the iOS 27.1 biometric breakdown quickly to restore confidence in its new hardware lineup.