i ve had every iphone since the 2g and jailbroken 100's and not 1 brick, its simply a matter of restoreing your phone within itunes if ever anything went wrong. and although apple doesnt like it, its very legal to do so. its an app that lets you install third party apps outside of itunes store, hundreds of tweaks ringtones themes untilities and the list goes on. all are free. and that means released free not paid apps that you get for free as we all know is illegal. alswell as giving you access to the os on the phone.
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