http://www.washingtonpost.com/blogs/the-switch/wp/2018/04/21/att-and-verizon-are-again-being-investigated-for-collusion-heres-what-happened-the-first-time/

The Justice Department is currently investigating whether AT&T and Verizon may have colluded to thwart a technology that could allow wireless customers to switch network providers more easily. But antitrust officials conducting a similar probe in 2016 found little evidence for the claim and ultimately dropped the inquiry, according to a letter sent by the Justice Department and obtained by The Washington Post.

In closing the Obama-era investigation, the government said that while mobile carriers had pushed for new industry policies that raised competitive concerns, their initiative proposed little more than a “technical capability” for cellphones without clearly demonstrating how or if companies such as AT&T and Verizon might use it to gain an unfair advantage.