Unable to connect to network in Ubuntu Virtual box, Host machine with mobile phone internet connection

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http://askubuntu.com – please help me in this. My host machine using Windows 7 operating system. I have a virtual box with Ubuntu 10.04 operating system also. I have internet connection in my host machine by Nokia 5230 modem. How could i get internet connection in my Ubuntu virtual box ?? I have tried my virtual box network settings with bridge adapter,Nat, Host only etc.I have configured Ubuntu network connection manually under "wired" tab, by assigned an ipv4 address which was just next to the IP address of host machine (windows machine is and i have set virtual box IP with and all o (HowTos)