The Justice Department is reportedly investigating whether Verizon and AT&T worked with a telecommunications standards group to block a new technology that would allow people to switch carriers more easily.
Verizon and AT&T dominate the industry with around 70 percent of U.S. wireless subscriptions. A new technology called eSim might have threatened that — it would allow users to switch carriers remotely without buying a new carrier-specific SIM card.
The DOJ is reportedly looking into whether there was an effort to make that technology effectively useless.
The DOJ hasn't confirmed the investigation, but AT&T said in a statement it was working with investigators. The investigation reportedly started when Apple filed a complaint.
Additional reporting by Newsy affiliate CNN.