BB Curve :: Wi-fi And Email Setting Not Working?

I bought a Curve 8520 from O2, without internet data allowance. Ever since the day I got it, the wi-fi setting didn't seem to work properly. The 'wi-fi' icon on the home screen is permenantly grey, and there is always a white '-' after 'wi-fi' in the 'manage connection' window, although the mobile shows that it has been connected to the wi fi network. In the browser selection, there is only a 'hotspot' and an 'O2 active'.

The other problem is about email setting. In the 'Email setup' panel, there is only a 'I want to use a work email account with a blackberry Enterprise Server', but without a private email account seeting. And without being able to connect to a wi fi network, I cannot use the email function at all!The other equiry is about the 'SIM card' option in 'Advanced option' list. The phone number appear to be 'unknown number'.