How much does it cost to change my Cingular Number?

Annoying people won't stop calling me. I need to how to change my number and how much it's gonna cost me.How much does it cost to change my Cingular Number?I know Verizon charges US$ 15.00 to change each number. You take your cellular to any Verizon store and ask for anyone at the technical support to do the change. It took 3 minutes to have my number changed.