UPDATE: An AT&T spokesperson gave us the following statement:

News has broke this afternoon that the US Department of Justice has opened an investigation over antitrust concerns and potential collusion between Verizon and AT&T in efforts to prevent eSIM adoption and progress. Apple Watch and iPad both use eSIM technology and Apple is reportedly one of multiple manufacturers who has raised concerns with the DOJ. 

In a report from The New York Times, details include the possibility that Verizon and AT&T (the top two US wireless carriers) were also working to block eSIM tech with the mobile industry standards group, the GSMA.

Anonymous sources told the NYT that official complaints were filed roughly five months ago, and two months ago the DOJ issued demands to AT&T, Verizon, and the GSMA. The Justice Department declined to comment on the matter to the NYT.

The report notes that the two carriers handle about 70% of US wireless customers, and that the eSIM tech makes it easier to switch carriers.

Apple has been including eSIM technology in its iPads for some time now, and began offering it with its Series 3 cellular Apple Watches as well. Notably, Verizon doesn’t let iPad users activate cellular service with the eSIM and AT&T locks devices that use the eSIM. Google’s Pixel 2 smartphones and Microsoft’s Surface devices also use eSIM tech, hinting that these companies may have had reason to file complaints as well.

Tweet’s from Bloomberg’s Mark Gurman and Eric Newcomer note that Apple is said to be one of the manufacturers who complained to the DOJ and that the company’s complaints may have led to the investigation.

Verizon did respond to the matter, saying that it was all “much ado about nothing.”

*MULTIPLE DEVICE MAKERS SAID TO HAVE COMPLAINED TO DOJ

*DEVICE MAKERS SAID TO HAVE COMPLAINED ABOUT SWITCHING ISSUE

*APPLE SAID TO HAVE COMPLAINED TO DOJ ABOUT SWITCHING ISSUES https://t.co/ktDvIkrYZQ

— Mark Gurman (@markgurman) April 20, 2018

APPLE SAID TO BE BEHIND U.S. MOBILE CARRIER COLLUSION PROBE https://t.co/8qZrPSm0v3

— Eric Newcomer (@EricNewcomer) April 20, 2018

AT&T and the GSMA declined to respond.