The T-Mobile "Total Internet" plan is for use on Windows based smart phones, such as the MDA, SDA, and Dash, or for using your phone as a wireless modem for your laptop.
BlackBerry's are setup to have their own special packages.
You will need the "BlackBerry Unlimited Add-on" for these services.
BlackBerry 8320 Curve [Titanium] T-Mobile
PIN: 24708EAC .. OS v126.96.36.199