As of October 1, Sprint raised pay-per-use text messaging rates to $.15 per message. Some see this as a material change to services provided, since unlike 411, a customer cannot use an alternative service.
As such, if it is a material change, customers can be released from their contract within 30 days. However, Sprint has not commented on as to if this is a material change of services provided.
CBS 13 in Sacramento claims they have found an answer. According to their reporting, the change is indeed material, and customers can cancel ETF-free within 30 days (providing they do not pay a bill after October 1, which would be an acceptance of the plan change).
Update: PCS Intel has independently verified that Sprint will cancel accounts, and waive the Early Termination Fee for this. We successfully canceled a Sprint account ETF-free when contacting customer care.