A:
I upgraded recently (and many times before in the past) and taking advantage of the upgrade renews your contract. To negotiate a lower price contact your provider directly, but if you have no problem with what you're currently paying just head to Best Buy and grab your desired device. The staff there will explain when your next upgrade will be available. The length between upgrades is your contract so with any new upgrade you're renewing your contract.
Keep in mind, when you're due for an upgrade this is also the time that you can cancel your service.