Apple sends jailbroken iPhones to researchers to find vulnerabilities.

Speaking to Business Insider , Spanish security researcher Gergely Kalman said that jailbroken devices allow experts to run arbitrary code to search for vulnerabilities and bugs. Apple previously offered a $1 million reward for bug finds in 2019 and announced it would soon send "special" versions of iPhones to security researchers.

The jailbroken iPhone that Apple sent to Georgely Kalman.

Apple's efforts are aimed at preventing potential exploits after a growing number of hackers abused the system. Just last December, the Russian cybersecurity firm Kaspersky discovered one of the most "sophisticated" 0-day vulnerabilities in iOS. This allowed hackers to exploit Apple's iMessage file attachment feature to bypass iOS's hardware-based memory protections and gain full control of the device. Notably, hackers could infiltrate and steal sensitive data without the user opening the compromised message.

Although Apple later patched the vulnerability, Kaspersky still criticized Apple, arguing that its devices were never truly secure in the face of increasingly sophisticated cyberattack methods.

Images posted by Kalman show a jailbroken iPhone that allows developers to investigate the system in a client-like state. Researchers can add developer tools and platform privileges to the device through its subsystem. These special iPhones have not gone through the complete manufacturing process and are not intended for widespread use.

Jailbreaking an iPhone is equivalent to rooting an Android device, which allows users to modify the phone's operating system. Non-developers should not root or jailbreak their phones as it can break the device's system in the process, and may even result in the loss of their Apple ID.

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