lol go to options, advanced options, then tcp, You'll need to contact your providor for the correct addy, but where it sais APN (for T-mo I put wap.voicestream.com) you will need to put a address from you carrier.. leave the username and password blank.
Mine is wap voicestream, too. I'm pretty new to mobile browsing, Angi, but I've found the BlackBerry browser works real well for most sites because the good ones recognize you're on a mobile - and the others aren't too hard to move around in with the BB browser. I have kept Opera Mini for the one or two I need to enter data in - like my insurance co's website, but I use it less and less everyday as I get better.
If you haven't yet, make sure you go to wap.crackberry to put the link to this place on your desktop. It works great.
Posted from my CrackBerry at wapforums.crackberry.com