Help in connecting to internet using phone modem.

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http://www.ubuntux.org – Hi, I want to connect to internet using my phone modem on Ubuntu 9.04 . When I create a new connection and all the settings that are required , it shows that you are now connected. But when I try to access the internet ,I cant. I can;t open any page nor can i download and install any package using the apt-get command. now please help me in solving my problem. (Distributions)