Soon after the rules were enacted, Verizon and MetroPCS brought claims challenging the rules. These challenges were brought before the D.C. Circuit, in large part because of that Court's ruling against the FCC in the Comcast case. That case revolved around allegations that Comcast had improperly been slowing down certain kinds of traffic on its network. Because of the Court's ruling in that case, Verizon in particular, believed that it had a good chance for success in its net neutrality challenge.
The D.C. District dismissed the initial claims by Verizon and MetroPCS because they the issues were not yet ready for consideration. The net neutrality rules cannot be challenged until they have been properly filed in the Federal Register.
Recently, Free Press also brought suit against the FCC and its net neutrality rules, and several claims in support of the rules were filed in various other Circuits. Those claims were brought before the 1st U.S. Circuit Court of Appeals in Boston. Verizon refiled its claim last week and on Thursday the D.C. Circuit was chosen at random to be the court to hear the challenges.