You have to put in the TCP/APN settings for it to work. Google for TCP/APN t mobile and it should be able to give you the listing you need. Its in the settings, advanced settings, tcp portion of your BB if I remember correctly.
Select "Options" (The Wrench Icon)
Select "Advanced Options"
Select "TCP"
Input "wap.voicestream.com" in the APN field (leave the other fields alone or blank)
When you run the Opera Mini program installed on your phone it should connect now.
i have installed it on my 8700g, juz curious if I will be slapped with data charges if im surfing using Opera mini instead of BB browser. I have configured the following on my BB:
"Options" ->"Advanced Options" -> "TCP"
Input "blackberry.net" in the APN field
My provider's helpdesk insist that surfing is only free if I use BB browser, and not other browsers... :c