Ubuntu 11.10 Mobile broadband connected but no internet access

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http://askubuntu.com – I am able to establish a mobile broadband connection but I still don't have access to internet. The mobile broadband works without any issues from Windows 7 on the same machine. I configured the mobile broadband connection in the unity network manager. I chose the only available device, "Dell DW5550", provided my country and ISP and specified "MMS" as the plan. When I choose the mobile broadband connection it says "connection established" and appears to have an IP address: $ ifconfig usb0 Link encap:Ethernet HWaddr 02:80:37:ec:02:00 inet addr: Bcast:172.29.1 (HowTos)