Mobile phone companies have to let you out of your contract if they make a materially adverse charge to your contract. That is, if they raise a fee, impose a charge, or change a rule that applies to the contract you are under right now, they have to let you out of your contract without an early termination fee. (Changing the contracts for new customers going forward doesn’t count.) If you want out, this is traditionally your chance, even if companies try to put up a fight.. Unless you’re reader Mark, a Sprint customer, who Sprint won’t set free. But Mark is no ordinary, naive Sprint customer. He not only reads Consumerist, but he worked for Sprint just a few short years ago. He knows how this is supposed to work.