Unable to Connect to internet Even though WiFi or Mobile data ON

Hi Sir,

I have bought Samsung Galaxy S Duos 1 day before and I am unable to connect to internet even though the Wifi or the Mobile data is ON.

Internet settings have been checked while connecting to Mobile data. and Wifi key has been provided and is showing As connected. but still unable to access internet.

Please advise. Thanks in Advance

Kind Regards
Rahul