AT&T has misled millions of its mobile customers by promising unlimited data plans, then charging them and reducing their data speeds after they reach a monthly cap, the U.S. Federal Trade Commission said in a complaint announced Tuesday.

Some AT&T mobile customers had their data speeds reduced by nearly 90 percent after reaching a monthly data cap, the FTC said.

The company failed to adequately disclose to customers on “unlimited” data plans that it would reduce speeds after they reach the monthly cap, the FTC said in a news release. AT&T reduced data speeds to the point that many common mobile phone applications, including Web browsing, GPS navigation and streaming video, became difficult or nearly impossible, the agency alleged.

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