TROUBLE SHOOTING GPRS

Hello,

i have recently bought a windows viva touch and had activated airtel gprs. since two days i am not able to access the internet ,. i have checked the setting it is fine i contacted airtel help but still whenever i click internet explorer it shows connection to network failed and i am always getting a notifiction that the settings of my mobile does not match that of network. though iahve set it according to airtel.

pls help