The modification of system-level software on Apple’s older mobile devices, specifically the iPhone 4S running a particular operating system, to remove restrictions imposed by the manufacturer. This process allows users to gain elevated privileges, granting access to the root file system. An example is enabling the installation of applications not available through the official App Store.
Historically, this practice provided access to features and customizations not natively supported by the device. This included the ability to install custom themes, access advanced system settings, and utilize applications offering functionalities beyond Apple’s approved parameters. This circumvention allowed users to maximize the device’s potential according to their individual needs, often extending the lifespan of older hardware by adding functionalities available on newer devices.