Change my Verizon account, number, or phone to my old phone?

Hello(:

I have a 2 year contract with Verizon and I currently have a Pink Venus. My cousin had a phone, and I want to change my phone to her phone without switching my number. How do I do that?Change my Verizon account, number, or phone to my old phone?
As long as her phone is clear, in other words her account is up to date, all you have to do is take it to your nearest Verizon Wireless store and they will switch it over for you. Takes about 2 minutes.