Someone with a better memory or search engine capability can weigh in, but I'm pretty sure T-Mobile had a bunch of restrictions lifted for no reason that were imposed on them because they were illegally charging customers who switched plans or something.

Edit: this was bothering me so I did some more digging. Verizon was the company I was thinking of, but I confused it with TMobile because the FCC waived restrictions on their merger with sprint and there were a bunch of antitrust lawsuits about that.