A major point of T-Mobile's CES presentation today was the carrier's fast data speeds. CEO John Legere boldly proclaimed that his company now has the fastest 4G LTE network in the United States, claiming superiority over rivals AT&T, Verizon Wireless, and Sprint. And he's apparently going to try backing up the claim — legally. Legere said that he plans to serve AT&T with a cease and desist letter over its own "fastest network" advertising.  "I'm going to send a cease and desist letter to AT&T telling them to stop their ads saying they are the fastest," he said. "You know how many billboards they are going to have to take down?"

The debate over which US carrier truly has the fastest data network is a complicated one. Verizon Wireless and AT&T have both laid claim to the honor at times, using a variety of data points and fine print to back their proclamations. Now T-Mobile is publicly trying to take the crown. We've reached out to the carrier for more information on the cease and desist order.