How much does it cost to change your cingular phone number?

I keep gettin calls from people asking for luis or jesse or jason etc. when there is nobody by that name. I want to change my phone number. Anyone knows how much it costs to change your phone number with cingular?How much does it cost to change your cingular phone number?
The first time you do it, they won't charge you. This I know for sure.



I think they start to charge you the fourth time you do it.How much does it cost to change your cingular phone number?
They won't charge you depending on the reason. You must tell them that you are receiving 'harassing calls'.