https://www.cnbc.com/2019/02/08/sprint-is-suing-att-over-deceptive-5g-e-campaign.html

Sprint is suing AT&T for what it calls a "deceptive 5G E campaign" in which AT&T seeks to "mislead customers into believing that it currently offers a coveted and highly anticipated fifth-generation wireless network, known as 5G."

The complaint is a step toward legal standard in the burgeoning 5G space, and could trigger an embarrassing rollback for AT&T in its marketing if the judge rules in Sprint's favor. Tech news site Engadget first reported the lawsuit.