The wireless industry is increasingly worried about a series of long-running, class-action lawsuits in state courts. One lawsuit against Sprint Nextel is under way in California, and plaintiffs in a New York case in arbitration are seeking $1 billion in refunds.

Federal law prohibits states from regulating wireless rates but gives them authority over some terms and conditions under wireless contracts. The industry's Washington lobbying group, CTIA, previously asked the FCC to consider cancellation fees to be rates, which would preclude state governments and courts from any jurisdiction over them.

In September, Sens. Amy Klobuchar, D-Minn., and Jay Rockefeller, D-W.Va., introduced the "Cell Phone Consumer Empowerment Act," which would require prorated fees and a 30-day window for customers to exit a contract.