Hi, I have here (2) 3GS iPhones. One I was able to jailbreak and unlock quickly with no problems at all. The 2nd one seemed to be going ok but after jailbreaking it and updating cydia it began rebooting on it's own. Now I have tried restoring in itunes many times and the problem persists. The phone turns on but after 10-20 sec. it reboots to the apple logo and so on. I posted a short video on youtube to show what I mean here: http://www.youtube.com/watch?v=D7IOPr8Ierc I'm figuring this phone will need to be returned to Apple for an exchange. Any help would be appreciated. Thanks in advance!