I am a new user to BB. I am not able to use the browser to surf when the mobile network is turned off but Wifi is on and connected. I have tried different settings with browser but no solution.
WiFi requires a network connection as it requires a BIS/BES subscription. It has to have EDGE/3G to check for this. This is why you can't buy a Bold just to use WiFi without the data package.
What kbright said is true. Assuming that you asked for it, I reckon your line has not been provisioned for BIS yet (cause it's the weekend). Give them a call on Monday to make sure it happens.