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That's a Windows Phone device isn't it?
ATT....first thing I can think of do they allow tethering on your data plan? Like you may have to pay an extre fee for it. Android devices you can sometimes install an app that will do tethering, root maybe required, or you can turn it on with rooted devices. Win Phone, not a clue.
Maybe you'd get better answers if you asked in a Windows Phone users forum?
can mark question as answered - i figured it out.