Please help blackberry wifi?

[Take me away..]

Hello, so on my blackberry curve 8520, I have connected my internet wifi to it and it works. I can download apps from the blackberry app world, and all my applications work like facebook or what'sapp and stuff like that, but as soon as I go on the web browser it says: "Unable to connect to the Internet, please try again later. If the problem persists please contact your service provider."

It's been like that for about 4 hours now. What should I do?? And I also deleted my blackberry app world by mistake so I can't download it anymore :'( Please help! Thanx!!!