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Joe Raedle/Getty Images(CNN) - Sprint, the nation's fourth-biggest wireless carrier, may have wrongfully made millions of dollars from a federal subsidy program designed to make cellphone and Internet service more affordable for low-income Americans, according to the Federal Communications Commission. But Sprint was ineligible to claim the federal funds, the FCC said, because it failed to report that the customers were not actually using the subsidized service. "It's outrageous that a company would claim millions of taxpayer dollars for doing nothing," said FCC Chairman Ajit Pai. The investigation into Sprint comes at a delicate time for the company as it seeks to complete its merger with T-Mobile. "When companies abuse the Lifeline program, we should throw the book at them," Jessica Rosenworcel, a Democratic FCC Commissioner, tweeted.