Ok, so I sold my iPhone, and the person buying it was intending on using it with T-Mobile (I use AT&T), so I was going to unlock it and jailbreak it for him. Today, I got an email from him saying that he was unable to get his T-Mobile sim card to work with the iPhone, and I'm worried it was something I did. This is what I did: -I completely restored my iPhone though iTunes, so that none of my stuff was left on it. -Using QuickPWN for Windows, I connected my iPhone to the computer to jailbreak 2.2. It automatically detected the firmware, and after that, I selected that I wanted to install Cydia, as well as 'Unlock Phone'. I then selected the two bootloaders, and it started to Jailbreak. -Once the phone eventually restarted, it went though the flashing/unlocking process (I believe) and it took maybe 5 minutes. After that, it eventually restarted, and fully started up. After that, I just turned it off, and sent it off. Is there anything that I missed, or messed up on? Was a specific sim card supposed to be in the phone? Thanks!