I seriously doubt Cingular would grant your request to unlock your phone for that reason. Your best bet is to do the software unlock. (or say you're travelling abroad )

My request to unlock my phone was honored because I am doing international travel in the near future (two weeks from now), and wish to use a European SIM card. I am near the end of my current contract. I made the request almost two months ago (see above).

You have to meet certain requirements of your current Cingular contract for the subsidy unlock request to be granted.