Oddly enough I canceled with Sprint for the same reason (they raised the price of what we contractually agreed I would pay).  I called and had no problem getting my contract cancelled and going month to month.<p>Years later I get a check in the mail for $200 from a class-action law suit related to this Sprint fee.<p>Always read the contract. They say specifically they reserve the right to raise the cost of the bill, but if they do they provide some amount of days for you to cancel the agreement.