This is what i did when connecting to cingular. In control panel select connections, then choose your phone connection then edit. In the next screen there are 2 lines where you need to replace with 'wap'.

I believe it sould say wap.cigular, and wap@cingulargprs.com. Leave the other lines as they are such as password etc. Let me know if this works. Also IM assuming you chose cingular internet as the default choice.

CobraKC