We asked AT&T if it still believes that it would be impossible to comply with the zero-rating rule only in California. We also asked AT&T if it is complying with all of the requirements in the California net neutrality law throughout the US since it argued that the Internet does not recognize state borders. AT&T declined to answer our questions, and a spokesperson said that “most of the things you asked about are industry-wide issues not specific to AT&T.”

“AT&T’s claims were and continue to be false,” Stanford Law School professor Barbara van Schewick, a prominent net neutrality supporter, told Ars. Van Schewick is also director of Stanford’s Center for Internet and Society.

The California net neutrality law is the only state-level law that matches all of the protections in the FCC rules that are no longer enforced, van Schewick said. But contrary to AT&T’s claims, she says it’s possible for ISPs to comply in California and implement other policies in different states.

“If an ISP decides to comply with California’s net neutrality law nationwide, that’s its choice. California’s net neutrality law does not demand that,” and “implementing net neutrality state by state isn’t a technical challenge,” she said.