Go to Settings>Connections>GPRS,
Highlight IMS CINGULAR And click ok.
It should Connect to: The Internet
Under Access Point It currently says: ims.cingular
THIS IS THE PROBLEM HERE>>>>>>>> Change this to:
USER Name: Should Be Blank
Password: Should Be Blank
Authentication: Should be CHAP
Primary DNS: 0.0.0.0
Secondary DNS: 0.0.0.0
IP ADDRESS: should Be Blank As well...