Provided that you are eligible for an upgrade.
Agree not to be "eligible" for newer upgrades for the next two years, and realize that any deviation from these terms is a violation of your "contract" with your "carrier". Requests to terminate your contract early will be honored provided you pay a $200 early termination fee. Your carrier reserves the right to blah, blah ...first born child... blah, blah...

Again, this is a side argument best served by a new thread.