Not internet using Nokia 2700 classic

Hi all,

I have a Nokia 2700 classic phone. I have downloaded all the GPRS settings from my service provider. I can access GPRS on my phone without any problem. I have Nokia PC Suite ( version 1.51) installed on my computer. Also I have a TATA Docomo connection. My problem is that I am not able to connect my laptop to internet using the phone as a modem through an USB cable. The One-Touch Access on the laptop shows that I'm connected to intenet and even the Networks and Sharing Centre shows that 'Internet and Local' connectivity. But still I'm not able to connect to internet using any browser( I have IE,Firefox and Chrome). The Nokia Connectivity cable drivers have been installed, so are Windows drivers for Nokia Modem connection.