i use t-mobile too,. since my area dont get 3gs internet i ask them to take my internet out,. since my phone(galaxy s) has option to turn off internet connection so no excuse for accident button u press to access internet.

you dont use much bandwith playing css,. coz u already has the map and plug ins from servers, i suggest going to option, multiplayer and select "do not download custom files".

using uttorent/or any form will slow down your connection,.