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I am using Vodafone 3G through my mobile Samsung B7320. I connected it via USB cable to my laptop running Ubuntu 12.04. A "Wired connection Established" message appeared.

Then I tried to access the Internet, but it's not working. Is there any additional configuration step that I should perform?

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Did you enable USB tethering? –  devav2 Dec 26 '12 at 4:47

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