The 8330 does not have Wifi. And yes you can tether it. Make sure you have Unlimited Data and then Google it. I do it with my T-Mo curve. Slow as **** but helps on the go.
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You can tether your curve easily the price depends on your dara plan. It is 15 if your on the 44.99 plan and 30 on the 29.99 plan. The speed isn't bad either.
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So it costs more on top of your unlimited T-Mo plan to use it as a modem? I tried it at work today unsuccessfully and now I am thankful it didn't work from this new information.