The Federal Communications Commission has announced its intention to fine AT&T $100 million for “misleading its customers about unlimited mobile data plans.” According to the FCC, AT&T “severely” slowed data speeds for customers with unlimited data plans, and the company “failed to adequately notify” customers that speeds could be slower than advertised. Millions of customers were said to be affected by the slowed data. As the FCC notes, AT&T no longer offers unlimited plans to new customers, but many long-time customers have retained the unlimited plan from when it was offered in the past. The company has been charged with violating the 2010 Open Internet Transparency Rule. AT&T said in a statement that it would “vigorously dispute the FCC’s assertions,” claiming it has been “fully transparent” with customers.