I am using Opera Mini on my BlackBerry 8320 as well as the BlackBerry browser. The BlackBerry browser shows a small icon at the top right corner which states which data connection (GPRS, EDGE or WiFi) is used. How do I know which one is used by Opera Mini?

I prefer WiFi as it is free of charge at home and at the office

Do you guys know how I can find that out?

If you were in a wi fi area it should automatically detect it. Same with edge.