cant change default browser configuration

so i just recently purchased my pearl 9105 from the uk. my carrier is t mobile. ive tried calling them and going to there stores but they couldn't find a way to fix my issue. i cant seem to change my browser out of the hotspot browser. ive been told to keep going to option, advanced options, and then to the browser. it wont give me any other options to select but the hotspot browser. my wifi email and bbm works just fine. but i cant switch my browser so i can use 3g. can anyone help me with my problem? or know where i can find the service books for this? thanks!!!