Can't view Cellular Data network on legally unlocked iPhone 3GS

I bought an iphone from Singapore and those phones come as unlock. Now that I am in the States, I was hoping to use my corporate AT&T sim card for data surfing and all. While I am able to make calls, it says that I am not registered for cellular data network. I was able to surf the web using the same SIM on this other HTC phone.
I was hoping to change the APN settings but that appears to be missing. How can I change the settings to that of AT&T?
Thanks!

Do you know the data plan rate your employer is paying for your HTC phone or for whatever phone the data plan is for?
AT&T's enterprise data plan for the iPhone costs $45/mo.
Sounds like you or your employer will need to contact AT&T customer support.

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