Default Star N9776 not working with straight talk 3g

I have a Star N9776, and it only picks up Edge. 3g is enabled in the settings, but it won't pick up anything but edge. I have 3g in my area, so I'm not sure the problem. I'm using the Straight Talk AT&T sim. It's the new sim. It has to be my phone, because my other friends with straight talk have 3g. Can anyone help me?
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