We have an account with 2 iphones on EDGE and 1 not on EDGE. The one not on EDGE is 10 months into a new contract. I put this line on a 2 year as I didn't really understand the benefit of EDGE and no one explained it to me fully. Is it possible to pay off one of the EDGE phones/lines and transfer the upgrade to the non-EDGE line so I can upgrade it to the iphone 6? We would also upgrade the then paid off EDGE phone with another iphone 6.