I've spent a night googling for the settings and trying different combinations and finally!!! i've got 'em and hurry to share:
You can edit the existing Cingular connection "MEdia Net GPRS" or remove it and add a new one.
Connects to: Internet
Access point: proxy
Primary DNS: 0.0.0.0
Secondary DNS: 0.0.0.0
IP Address: <blank>
You can edit existing proxy "Cingular WAP" or remove it and create a new one.
Connects from: Internet
Connects To: WAP Network
It all workd pretty good and seems to give EDGE speeds with my ATT Wireless sim card. Also tried tethering with my laptop and that also works fine.
I hope it helps You, The Last ATT Wireles Mohigans