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*(Via MSN News) – U.S. authorities filed a complaint against T-Mobile USA on Tuesday, accusing the wireless provider of adding millions of dollars of unauthorized charges onto customers’ bills, a practice known as “cramming.”

The charges were for subscriptions for services like horoscopes or celebrity gossip delivered by text message, which often cost $9.99 a month. T-Mobile USA received 35 to 40 percent of the amount charged, the Federal Trade Commission (FTC +1.21%) said.

In many cases, customers never authorized the charges but were signed up without their knowledge, the commission said.

The Federal Communications Commission also announced it was investigating T-Mobile USA for cramming and said it would coordinate with the FTC.

The FTC asked the court to order T-Mobile USA, the fourth-largest U.S. mobile phone provider by number of customers, to stop mobile cramming, provide refunds and give up any revenues from the practice.

The company, which has a reputation as a price-cutter, said in a statement that it had already stopped billing for the text services. It announced on June 10 that it was reaching out to “crammed” customers to tell them how to request a refund.

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