AIM service on Cingular Phone Does not work

I recently bought a phone off eBay that the previous owner used through
cingular, it is not an unlocked phone or anything, just a regular cingular
phone. (Sony Ericsson T237)

I swapped SIM cards, everything works fine, including the internet, the
only thing not working is AIM, the phone has it, I am signed up for the
service, but it won't log me in.
It gives me a "network error", so I tried a couple different AIM
servers and all it did was sit there trying to log me in, however I did not
get an actual error message after I changed the AIM network settings on
the phone.

I called cingular a few weeks ago about it and the woman on the phone
was of almost no help at all (big suprise there), she said she would
escalate my issue, which has (of course) gone unresolved, I thought
maybe someone around here has it working, or maybe knows what the
network settings should be for AIM.

Any info/help would be greatly appreciated.

Thanks!

wishya luck