So NattyBee, When you moved your Upgrade from Line A to Line C. Did you have to speak to someone?
nope. I just went to the page and went to the MyVerizon pulldown and clicked on Upgrade a Device. it will pull your account info up, you will see when each line is eligeable, and you will see a link to Transfer Upgrade below the ones that're ready. then when you click on it, you'll get a little popup asking which line to transfer that upgrade to.