Can I take a SIM card from Go Phone and use it on a regular Cingular Phone?

I just ordered a Go phone from AT&T, I have a Razor from a previous Cingular account. I would like to use my Razor instead of the Go phone. Is this going to be possible? Can I just take the SIM from the Go phone and put it in the Razor? Thanks in advance for [...] http://bit.ly/qsecWu