you do not have to turn over the phone to do the ne2. it is based on the account not the phone. the problem is you must relinquish 710 now for settlement. tell them you want to swap the phones between the two lines -- they have done this in the past. put the 710 on wife's line. put samsung on your primary line. send in 710 for new phone on 2nd line. then when ne2 comes due send in samsung for new phone for that one. you could then swap them back. there is no ne2 available for secondary lines on family plan. they MAY agree to do this. yo are free to swap phones that you buy into the line.