Wirelessly posted (RIM BlackBerry 8300 Curve: BlackBerry8300/4.2.2 Profile/MIDP-2.0 Configuration/CLDC-1.1 VendorID/122)

No, the correct link is http://mini.opera.com, NOT http://www.operamini.com...

Go to this URL (address) using your device's Internet browser, with "BlackBerry" as the emultion mode, and it should work.