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AT&T lost an important procedural battle in July 2026 when a federal judge denied its request to temporarily block California’s Carrier-of-Last-Resort rules. For now, AT&T must continue meeting California’s qualifying basic-service obligations in its wireline territory, but the ruling did not end the lawsuit or permanently prevent the company from seeking permission to discontinue service.
The immediate effect for customers is mainly preservation of the status quo: this ruling did not disconnect landline customers or approve a shutdown. The larger question—whether AT&T may replace or discontinue certain legacy services while escaping California’s obligation to serve eligible customers—remains unresolved.
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What AT&T lost
AT&T asked the U.S. District Court for the Southern District of California for a preliminary injunction. The requested order would have temporarily stopped California from enforcing its Carrier-of-Last-Resort, or COLR, requirements while AT&T’s federal lawsuit proceeded.
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The judge denied that request. Reporting on the ruling says AT&T did not make the required showing that it was likely to succeed on its argument that California’s rules were preempted by federal telecommunications policy.
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That is significant, but it is not the same as a final judgment against AT&T. A preliminary injunction is temporary relief evaluated before the court fully resolves the merits. AT&T’s underlying claims remain pending, and the company may pursue an appeal or seek relief through later court proceedings and the Federal Communications Commission.
What the decision means for customers
- California may continue enforcing its COLR requirements while the federal case proceeds.
- AT&T cannot immediately stop accepting new qualifying basic-service customers based on the injunction it requested.
- The ruling itself did not disconnect existing residential or business customers.
- It did not guarantee that every customer will retain traditional copper-based telephone service indefinitely.
- It did not approve AT&T’s proposed June 1, 2027 discontinuance date.
AT&T’s proposed plan reportedly covered approximately 184,000 residential customers and 15,000 business customers in specified California areas. Those figures describe customers included in a proposed discontinuance plan—not people who have already lost service or who necessarily will lose it.
Customers should therefore distinguish between a court ruling preserving current requirements and an approved service-ending notice. The July decision was the former.
What “Carrier of Last Resort” means
California’s COLR framework requires at least one designated telephone provider in a defined service area to remain prepared to provide qualifying basic telephone service to customers who request it. The purpose is universal access, including in places where serving every customer may not be commercially attractive.
The California Public Utilities Commission describes the framework as technology-neutral. In practical terms, California says the obligation does not necessarily require AT&T to preserve obsolete copper facilities or provide traditional copper-based POTS—plain old telephone service—everywhere.
That distinction is central. The dispute is not simply whether AT&T may remove copper lines. California’s position is that AT&T may modernize its network with fiber, wireless, VoIP, or another technology while continuing to provide qualifying basic service. AT&T is seeking broader relief from the legal obligation itself, or from state requirements it says interfere with federally authorized service discontinuance.
Three different actions are being confused
The dispute involves three related but different concepts:
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- Facilities retirement: replacing or removing copper infrastructure, such as during a fiber deployment.
- Service discontinuance: ending a particular voice service or refusing to provide a replacement under applicable rules.
- COLR withdrawal: ending the legal obligation to serve customers requesting qualifying basic service in an area.
The CPUC has said its rules do not prevent AT&T from retiring copper and deploying newer technologies. Whether a replacement service satisfies all applicable requirements is a separate question.
Why AT&T sought the injunction
AT&T’s federal strategy relies in part on the FCC’s March 2026 Network and Services Modernization Order. AT&T argues that federal authority allowing network modernization, POTS grandfathering, or discontinuance preempts conflicting California requirements.
AT&T’s position, as described in the litigation and FCC filings, includes several points:
- California’s COLR requirements allegedly interfere with federally authorized network transitions.
- Continuing to support legacy service creates business and constitutional harms.
- Modern alternatives—including fiber-based voice, VoIP, mobile wireless, and AT&T Phone-Advanced—can serve customers without maintaining copper POTS.
- Federal policy should prevent California from requiring service arrangements that conflict with the FCC’s modernization rules.
These are AT&T’s arguments, not findings that the court or FCC has finally adopted.
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California and the CPUC argue that AT&T is trying to withdraw from its service obligation rather than merely change the technology used to fulfill it. Their position is that federal authorization to modernize a network does not automatically eliminate California’s separate responsibility to protect access to basic intrastate telephone service.
California also says that a proposed alternative must satisfy practical requirements involving affordability, California LifeLine discounts, relay services, flat-rate calling, and 911 access. The CPUC has disputed whether AT&T Phone-Advanced, which uses AT&T’s wireless network with existing analog phones, meets every applicable COLR requirement.
The dispute’s history
March 2023: AT&T seeks COLR relief
AT&T filed a California application seeking permission to withdraw its obligation to offer telephone service to anyone requesting it within its California service territory. The CPUC’s Public Advocates Office said the request could affect a territory containing approximately 29.5 million Californians and more than 500,000 traditional landline customers. Those numbers describe the potentially relevant territory and customer base; they do not mean every person or customer would lose service.
May 2024: Administrative-law judge recommends dismissal
A CPUC administrative-law judge recommended dismissing AT&T’s request with prejudice. The proposed decision concluded that AT&T had not shown it could withdraw under the applicable COLR rules.
The reasoning identified several problems, including that:
- A potential replacement COLR would need to be allowed to replace AT&T.
- No potential replacement provider had volunteered to assume the obligation.
- AT&T’s proposed alternatives did not qualify as COLRs under the relevant framework.
- AT&T could modernize its network without first abandoning COLR status.
June 28, 2024: CPUC formally rejects the request
The CPUC formally rejected AT&T’s withdrawal request after public input and public forums. The commission said it received more than 5,000 public comments and held eight public forums attended by more than 5,800 people. It also opened a rulemaking to examine the future of COLR obligations.
2025–2026: California examines modernization
The CPUC’s ongoing COLR rulemaking examines the definition of basic service, which provider must serve as COLR, the conditions for stopping service to a community, universal service, affordability, broadband, and public safety.
The Public Advocates Office has also described a 2026 joint proposal with AT&T that would modernize COLR requirements rather than eliminate the obligation altogether. According to the office, the proposal would link any transition away from copper to continued access to voice or broadband service, fiber investment, and participation in programs such as California LifeLine. It is a proposal—not a final resolution of the entire dispute.
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AT&T filed a federal lawsuit in May 2026 and separately petitioned the FCC. Its FCC requests include a declaration that California COLR rules and related requirements are preempted, forbearance from certain federal Eligible Telecommunications Carrier obligations under Section 214(e), and authority to discontinue residential and business POTS in specified California areas.
The FCC’s May 2026 notice describes the relief AT&T requested. The FCC’s June 2026 scheduling order says AT&T filed its petitions on May 20, 2026, with comments due July 7 and replies due July 22. Procedural deadlines do not amount to final approval.
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In July, the federal judge denied AT&T’s preliminary-injunction request, leaving California’s requirements enforceable during the case.
Why the preliminary-injunction standard matters
A preliminary injunction generally requires the requesting party to make a strong showing on several factors, including:
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- Irreparable harm without immediate relief.
- The balance of harms between the parties.
- The public interest.
The July ruling reportedly focused on AT&T’s failure to show a sufficient likelihood of success on its federal-preemption theory. That does not necessarily establish how the court will rule after a complete merits record, nor does it determine every issue raised in the FCC proceedings.
Federal preemption is the larger legal question
AT&T argues that federal telecommunications authority supersedes California requirements that obstruct POTS discontinuance. California argues that the FCC’s network-transition authority does not automatically erase a state obligation to ensure basic service and protect consumers.
The eventual analysis could involve different forms of preemption, including express preemption, conflict or impossibility preemption, and obstacle preemption. It may also require the court or FCC to define the boundary between federal authority over interstate telecommunications and service discontinuance and California’s authority over intrastate service and consumer protections.
The FCC materials currently establish that AT&T requested this relief; they do not establish that the FCC has granted it. As of August 18, 2026, the available record did not show a final FCC ruling or final merits judgment in the federal lawsuit.
Why a replacement service may not be equivalent
For a customer, the question is not simply whether another technology can carry a voice call. A replacement must work at the specific address and meet the customer’s practical needs.
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Rural coverage
Wireless coverage and broadband availability can vary sharply between neighborhoods, valleys, mountain communities, and remote locations. A service available somewhere in AT&T’s territory may not be a workable substitute at a particular address.
Power and outages
Fiber, VoIP, and wireless services may rely on powered customer equipment, an optical network terminal, a battery backup, or a functioning local network. They can therefore have different outage characteristics from traditional powered copper telephone service. No alternative should be assumed to work during a power outage without checking the equipment, backup power, and local network design.
911 access
Important questions include whether 911 is available, how location information is delivered, what happens when the customer’s equipment loses power, and how service activation, porting, congestion, and emergency-service coordination are handled. The FCC’s modernization materials discuss 911 requirements and replacement-service issues, but the July court ruling was not a final technical finding that any particular replacement is adequate.
Affordability
A technically available service may still be impractical if the price is too high. California LifeLine discounts and other affordability requirements are therefore material to the COLR dispute, particularly for low-income households.
Accessibility and connected equipment
Customers using medical monitoring devices, alarm systems, fax machines, TTY equipment, or other assistive technology may encounter compatibility problems when moving from copper POTS to wireless or VoIP. Ordinary voice compatibility does not guarantee compatibility with every connected device.
What happens next
Several tracks may proceed at the same time:
- Federal lawsuit: AT&T’s underlying claims continue unless the case is dismissed, settled, or resolved on the merits.
- Possible appeal: AT&T may seek appellate review of the preliminary-injunction ruling, subject to applicable procedural rules.
- FCC petitions: The FCC must consider AT&T’s preemption and forbearance requests, along with the related discontinuance issues.
- CPUC rulemaking: California continues examining how COLR obligations should operate as networks transition away from copper.
- Negotiation: The joint proposal described by the Public Advocates Office could provide a negotiated modernization path, although it is not a final binding resolution.
- Separate discontinuance processes: AT&T’s POTS-discontinuance requests may proceed through FCC procedures distinct from the district-court case.
What California customers should do now
The ruling does not require an immediate change to a customer’s service. Customers who receive a future migration or discontinuance notice should evaluate the proposal at their exact address rather than relying on general claims about wireless or fiber availability.
- Ask whether the proposed replacement supports 911 and provides accurate location information.
- Confirm whether it works during a power outage and whether battery backup is supplied, purchased, or maintained by the customer.
- Check eligibility for California LifeLine or other discounted service.
- Identify whether medical, alarm, fax, TTY, or other specialized equipment is connected to the telephone line.
- Ask about installation, number porting, fees, contract terms, and the deadline to switch.
- Keep written records of notices and contact AT&T or the CPUC if the proposed transition creates a safety, accessibility, or affordability problem.
Bottom line
AT&T lost its request for immediate protection from California’s Carrier-of-Last-Resort rules, so the rules remained enforceable after the July 2026 federal ruling. But AT&T did not necessarily lose the entire case. The company can continue pursuing relief in federal court and before the FCC, while California’s rulemaking and possible negotiated modernization framework continue.
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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThe key issue is not whether every copper line must remain in place. It is whether AT&T must continue offering qualifying, affordable, and reliable basic service as it modernizes its network—and who will be responsible for serving customers if AT&T is allowed to withdraw.
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