Hi, I purchased a 3gs iphone, with version 3.1 and firmware 05.11.07. The person who used it before me claimed to be on t-mobile, which obviously means that it had been unlocked. However, I can't find any evidence of Cydia or Ultrasn0w on the phone. Is there any way that I can verify that it is unlocked/jailbroken without a sim card, which I do not have? I haven't yet hooked it up to itunes for fear of a massive fail. Should I hook it up and create a backup at this point? Do I need to be worried about an automatic update to 3.1.3 or anything like that? I need someone who has been through this process to help me avoid massively f*cking things up here. Thanks!