When a device is booting, it loads Apple's own kernel initially.The device must then be exploited and have the kernel patched each time it is turned on.
By using a computer, the phone is essentially "re-jailbroken" (using the "boot tethered" feature of a jailbreaking tool) each time it is turned on.
With a tethered jailbreak, the user can still restart Spring Board ("respring") on the device without needing to reboot.
The moved files become inaccessible but stay on your disk which means you essentially just lose the space.
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Since software programs available through Cydia are not required to adhere to App Store guidelines, many of them are not typical self-contained apps but instead are extensions and customizations for i OS and other apps (commonly called tweaks).
This includes the i Phone 4S, i Phone 4, i Phone 3GS, and i Phone 3G models.
Apple has responded with updates to i OS: patching exploits and upgrading hardware.
Jailbreaking communities have not been legally threatened.
Moreover, during the unlocking process, there are options to Install Cydia and i Pad baseband as well.