AT&T is in a little bit of hot water with the FTC, yet again. The Federal Trade Commission filed a federal court complaint against AT&T Mobility, LLC, charging that the company has misled millions of its smartphone customers by charging them for "unlimited" data plans while reducing their data speeds, in some cases by nearly 90 percent. The FTC's complaint alleges that the company failed to adequately disclose to its customers on unlimited data plans that, if they reach a certain amount of data use in a given billing cycle, AT&T reduces – or "throttles" – their data speeds to the point that many common mobile phone applications – like web browsing, GPS navigation and watching streaming video – become difficult or nearly impossible to use. "AT&T promised its customers 'unlimited' data, and in many instances, it has failed to deliver on that promise," said FTC Chairwoman Edith Ramirez. "The issue here is simple: 'unlimited' means unlimited." According to the FTC's complaint, AT&T's marketing materials emphasized the "unlimited" amount of data that would be available to consumers who signed up for its unlimited plans. The complaint alleges that, even as unlimited plan consumers renewed their contracts, the company still failed to inform them of the throttling program. When customers canceled their contracts after being throttled, AT&T charged those customers early termination fees, which typically amount to hundreds of dollars. AT&T mobile customers and mobile customers in general will probably welcome clarity regarding unlimited data plans.