Can I Use my wifes 2year upgrade ?

[Briz600]

I been trying to figure out how to grab one of these for a good while now. I have 3 phones on my acct and only one of them is due for the upgrade price. the other 2 must wait a long time. Basically my wife said she is still plenty happy with her Phone and said that if I want I can use her upgrade.

Is that even possible to order the phone through telesales and use her upgrade and then put it on my phone # ? If not im gonna be waiting a long time