Recent earnings reports show that T-Mobile's subscriber growth remains much better than that of its larger rivals. The difference in service revenue growth is larger still.
AT&T boss Randall Stephenson talks about the Time Warner and Straight Path deals, Trump tax policy and wireless subscriber losses during the company's earnings call.
Delrahim can expect questions from committee members about questionable remarks President Trump made on the campaign trail.
Ajit Pai laid out his anti-regulatory agenda in a speech to the National Association of Broadcasters.