But the U.S. Supreme Court has ruled in favor of companies' right to force arbitration. The decision came from AT&T Mobility LLC v. Concepcion, in which the Concepcion family was charged sales tax on supposedly 'free' phones, and filed a class-action suit against AT&T. AT&T argued that the case should be dismissed because of the arbitration clause.
While the Concepcion family won in both California, and the Ninth Circuit Court, the Supreme Court ruled (5-4) that companies could enforce their arbitration clauses. That means that companies, like AT&T and other wireless carriers, will be able to confine customer dissent to individual arbitration, rather than class-action suits. While that means tremendous savings for carriers' legal departments, it also represents a loss of leverage for customers.
source: Ars Technica via Engadget