If you are on Media Works $24.99 and below YOU should be using wap.cingular...
I've heard that isp.cingular allows some compression scheme, it would speed net access, etc...
BUT from all the advise on tethering EVERYONE says to steer clear from isp.cingular (unless you are paying for it) because it would be a CLEARer sign to Cingular that you are tethering.
SOMEONE around here can provide the nitty gritty details I am sure...
Sadly I left palm; user since Robotics Palm Pilot; left att (glad of that though);
THE USA is just not GSM/UNLOCKED phone friendly (sorry, never tried T-Mobile).
I await a flagship WebOS phone... in the meanwhile...
Godfather to an Angel
Godfathered by an Angel