Wirelessly posted (BlackBerry 8700g: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0) BlackBerry8700/4.1.0 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/100)
The BB comes with a HTML browser and I have mine set to emulate IE.
The OZ client that you can download for T-Mo uses SMS. The good thing is that T-Mo has unlimited SMS plan for $10.
APN is simple to set up. Wap.voicestream.com you do not need to enter username or password.
Have fun with the 8700!