Unable to connect to the Internet

Hi there,

I have a problem for last 5 month with my Blackberry 9790.
I can't connected to the internet, although 3G coverage is full.
The system said : "Unable to connect to the Internet, please try again later - If the problem persist please contact your service provider"

Appreciated for your help to solve my problem...

Regards,
Josh

Do you have a BlacBerry plan with your provider? Do you see the BB symbol next to the connection symbol?