So to take full advantage you should upgrade everytime you're able and sell your new or old phone. It just makes sense.
who is going to buy the phone your selling if everyone is constantly getting new subsidized phones?
personally I don't think cellullar companies should be selling phones. I think they should focus on service exclusively. -- sbcglobal.net speedtest result 11/11/09 - 5256kbps
Cellular carriers in the US get a leg up on each other mainly by offering cooler phones than the other provider. Or exclusive phones anyway. Otherwise T-Mobile would have to compete more fiercely on price than they do already.