I read that if a jailbroken iphone reboots, it will lose it's jailbreak, will I lose the jailbreak when I turn my phone off after each call? would I lose my jailbreak if the battery completely drains, & when I attempt to turn it on it does not come on, & needs a recharge? what exactly is tethered vs untethered & how do I know if my iphone I bought off ebay is tethered or not? i read that an untethered jailbroken iphone will not lose it's jailbreak if it turns off for any reason. Does this mean most are tethered?