When wildfire season knocks out cell towers and the power grid, a copper landline becomes the last line standing. AT&T wants to cut that line for roughly 199,000 California customers and walk away from its legal obligation — known as Carrier of Last Resort, or COLR — to provide basic phone service to anyone in its territory. In a June 15 filing at the FCC, California fired back with a blunt accusation: AT&T has been misrepresenting state law to federal regulators to get what it wants.

AT&T’s Argument to the FCC

The company says California has frozen its copper network in amber — but the state says that claim has never held up.

AT&T’s pitch is straightforward. The company claims California regulations have “frozen” its copper network in time, blocking fiber investment and forcing it to spend roughly $1 billion per year maintaining infrastructure “almost no one uses,” according to its federal lawsuit filing, as reported by PCMag.

AT&T has sued the CPUC and California’s attorney general in federal court and separately petitioned the FCC to override state rules entirely. The company has already secured COLR relief in 20 of the 21 states where it operates, per Ars Technica. California is the holdout.

Here’s what’s actually at stake for affected customers:

• Indoor coverage reliability: AT&T’s own coverage maps explicitly show “approximate outdoor coverage” only. Buildings kill wireless signals — and AT&T hasn’t proven otherwise indoors.
• 911 access during power outages: Wireless and VoIP services go dark without backup power. Copper doesn’t.
• Monthly cost: AT&T’s LTE-based replacement may require a separate broadband subscription, making it costlier than basic regulated service.
• Accessibility gaps: Whether AT&T’s replacement supports California Lifeline subsidies or the Relay Service for deaf users remains unclear.

California’s response is the regulatory equivalent of pulling receipts at a dinner argument. The state points out that the CPUC explicitly declined in 2008 to adopt copper-protection rules — specifically to avoid slowing fiber deployment. The CPUC’s 2024 order reaffirms that its framework is technology-neutral. “COLR rules do not prevent AT&T from retiring copper facilities or from investing in fiber or other facilities/technologies,” according to the CPUC. California’s filing states AT&T’s claim to the contrary “is not and has never been true,” per Ars Technica.

What “Good Enough” Actually Means

The FCC’s Adequate Replacement Test is now the central battlefield — and California argues AT&T hasn’t come close to meeting it.

Using AT&T’s coverage maps to prove wireless replaces a landline is like showing a Google Maps screenshot to prove you actually drove somewhere. The FCC’s own broadband map disclaims indoor accuracy. AT&T’s coverage map carries the same caveat. California’s filing hammers this point directly: outdoor signal maps cannot demonstrate reliable indoor replacement without additional evidence.

AT&T has pledged $19 billion in California fiber and wireless investment by 2030, per PCMag. That is a significant number. But promises don’t fix today’s coverage gaps for rural residents, low-income subscribers, seniors, and people with disabilities who depend on consistent, affordable service right now — gaps that raise real concerns about home security systems and emergency communication reliability.

The FCC hasn’t ruled yet. Whatever it decides becomes the stress test for “adequate replacement” nationwide — and determines whether telecom modernization carries vulnerable communities forward or leaves them dialing into silence.