Sorry for not getting this out sooner. Here are some instructions on how to set up the A780 for data on various carriers. There are two places they have to be configured, in the Setup application and in the web browser. Comment if you have questions/problems...
CingularIn Setup, go to Data Network
Menu, New
Profile Name:Cingular GPRS
APN: wap.cingular.com
Save and close.
In the web browser go to Setup, Profiles
Menu, New
Profile Name: Cingular Web
Network Link: Cingular GPRS
Leave everything else the same, Save
T-Mobile WAPIn Setup, go to Data Network
Menu, New
Profile Name:TMobile GPRS
APN: wap.voicestream.com
DNS server (checked)
(1) 216.155.175.105
(2) 216.155.175.106
Save and close.
In the web browser go to Setup, Profiles
Menu, New
Profile Name: TMobile Web
Primary Gateway IP: 216.155.165.50
Port: 8080
Network Link:TMobile GPRS
Leave everything else the same, Save
T-Mobile Unlimited DataIn Setup, go to Data Network
Menu, New
Profile Name:TMobile GPRS
APN: internet2.voicestream.com
Save and close.
In the web browser go to Setup, Profiles
Menu, New
Profile Name: TMobile Web
Network Link: TMobile GPRS
Leave everything else the same, Save