How much does it cost to change phones in verizon?

I have an LG Dare, but I want the LG Chocolate. I have both, how much does it cost to change it? Do you have to pay at all?How much does it cost to change phones in verizon?ew why wud u even go from the dare to the chocolate?!?!?!!?!??!?!?1How much does it cost to change phones in verizon?Ew, I have the chocolate. And I'd rather have the enV3 cause the chocolate sucks ***.