[Brock1909]

could you add a line, to get the discount on the phone so its not 550$. then take the diamond(on the line you added to your account), and say your touch ( the line you will be keeping) switch the number over in a few days. and cancel the new line you added?
so that you have the new phone on your original number, and your old phone ( not diamond) on the new line you added, and eventually will cancel.

would this work?