HP mini netbook with my phone sim card AT&T?

I was wondering if I can use my att sim card from my buzz in my hp mini netbook, to surf the web and such even as on the road. My plot has unlimited everything, but I reflect when I need to access the internet it would be simpler on my netbook. It has a sim card slot installed but someone told me that I would need some software to make it work with my netbook.
Thanks

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