Wi-fi probem , I used 2 days and now i can not

The Wi-Fi is worked perfect since 2 days , and know when I would like to connect to facebook , bbapp world, or any page it says: "You are currently on a service plan that does not support this application, please connect to Wi-FI network or contact your service provider to upgrate your data"

On my BB home page I can see under the 3g and the mobile network the Wi-FI sign.. It have to be work , but don't :(

Please sombody help me!

Ps: maybe this is the problem? In the Mobile Network Options I pressed OFF the Data service and the While Roaming because my mobile network is so expensive.
THX