Your carrier did not tell you the truth. You must have a BB data plan to access any of the RIM related services. And RIM is not going to give you any help or the settings.
WiFi might get you on the Internet, but you can't access BIS for email, BBM, maps, Facebook, etc.
Maybe this from our FAQ will help: http://www.blackberryfaq.com/index.p...ta_Plan_for%3F