An anonymous reader writes The U.S. Federal Trade Commission today announced it is suing AT&T. The commission is charging the carrier for allegedly misleading millions of its smartphone customers by changing the terms while customers were still under contract for "unlimited" data plans that were, well, limited. "AT&T promised its customers 'unlimited' data, and in many instances, it has failed to deliver on that promise," FTC Chairwoman Edith Ramirez said in a statement. "The issue here is simple: 'unlimited' means unlimited." How apropos.