Fix - AT&T The Remote Party has ended this connection

Use the automatic settings manager under All Programs -> Accessories -> Connection Setup so that you get MEdiaNEt as a GPRS connection configured on your phone. Mind you, the configuration as pushed to your phone by AT&T doesn't really work.

The fix:

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:
wap.cingular
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...