Jailbreak

Jailbroken iPhone

This is the process by which full execute and write access is obtained on all the partitions of the iPhone. It is done by editing /etc/fstab to make things on disk0s2 executable, and make things on disk0s1 writable. This is entirely different to an unlock. Jailbreaking is the first action that must be taken before things like Activation, and usually Unlocking, can proceed.