Since I am going back to China and I need to use my phone in China. I called AT&T custom service to unlock my phone. They told me I need to wait until July to unlock my phone… So I have to do this on my own. Here is the instructions.
1. Root the phone using the software on http://shortfuse.org/?page_id=2
With SuperOneClick, you can also enable sideloading.
2. Unlock the phone following these two links: