shopping for a usb modem device

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http://ubuntuforums.org – Hi guys, Folklore says that some usb mobile devices work out of the box with Ubuntu, no configuration or driver installation needed. However, my searching of the ubuntu forums has only turned up stories of usbs that dont work, not ones that do. If any of you are using a usb mobile device that worked straight away, could you let me know? And also let me know what version of Ubuntu it works with? Desperation is setting in here. I am non-techy and wouldnt know how to configure anything, and I need internet on my ubuntu machine. Cheers, Thanks. (Hardware)