How much would it cost to upgrade early with Verizon?

My cousins just got a new phone so she gave me her iPhone 4. How much would it cost to upgrade early?

It doesn't cost you anything to change your cell phone. The only thing is with the iphone 4 you would have to add a data internet plan of 29.99 per month on top of your voice plan. Just visit any Verizon Wireless Store and the salesperson will switch your old phone to the iphone 4. You will still have the same phone number and the same plan.