Sprint are changing their terms significantly enough here that you can use this to break your contract with them if you so wish, without paying a break-off charge.

The FCC says that if a carrier changes their contractual terms and you are materially effected you can request the contract be terminated without penalty.

Although this is for Verizon, the steps are the same for all carriers: http://consumerist.com/2011/06/new-fee-lets-you-break-verizo...