Want to break your Sprint cellphone contract without paying an early termination fee? On January 1, 2009, Sprint will increase the Administrative fee to $.99 per line. Because this is what is known as a “materially adverse change of contract,” and because of the basic contractual principle that you can’t change someone’s contract without their explicit permission (not the tacit, “opt-out” kind), you can use it to argue that the fee renders your contract void and you can end service without a termination fee. You do have to be willing to argue without giving up with a number of different Sprint employees first, like Matt did…