In Facebook, Inc. v. Duguid, the Supreme Court unanimously held that a device is an “automatic telephone dialing system” under the Telephone Consumer Protection Act only if it uses a random or sequential number generator to store or produce the numbers it dials. The 2021 autodialer ruling ended years of split lower-court readings and cut off the most common theory plaintiffs had used to sue over automated calls and texts. Systems that simply pull numbers from a stored contact list and dial them no longer qualify as autodialers under federal law. Other TCPA rules on prerecorded voices, consent, and the Do Not Call Registry were not touched.
What the Court Held
The whole case turned on 14 words in a 1991 statute. Under 47 U.S.C. ยง 227, an autodialer is equipment with the capacity “to store or produce telephone numbers to be called, using a random or sequential number generator” and “to dial such numbers.”1Office of the Law Revision Counsel. 47 U.S.C. 227 – Restrictions on Use of Telephone Equipment The fight was grammatical: does “using a random or sequential number generator” modify only “produce,” or does it also modify “store”?
Justice Sotomayor, writing for the Court, said it modifies both.2Legal Information Institute. Facebook, Inc. v. Duguid The majority relied on the series-qualifier canon: when a modifier follows a list of terms joined by “or,” it ordinarily reaches every item in the list. “Store or produce telephone numbers to be called” reads as a single integrated phrase, two verbs sharing one direct object, and applying the modifier to only one of them “would be odd.” The comma before the qualifying clause reinforced the reading.3Supreme Court of the United States. Facebook, Inc. v. Duguid, 592 U.S. ___ (2021)
The Court also looked at where the opposite reading would lead. If any device that stored numbers and dialed them qualified as an autodialer, ordinary smartphones would too, and anyone sending an automated reply could face TCPA liability. That result would clash with the statute’s purpose, which was to stop equipment capable of tying up phone lines by blasting randomly generated numbers, not to police everyday communications.
Justice Alito joined the result but wrote separately to warn against treating interpretive canons as rigid rules. He described them as “presumptions about what an intelligently produced text conveys,” and cautioned that heavy reliance on them risks turning statutory interpretation into “a series of if-then computations.”3Supreme Court of the United States. Facebook, Inc. v. Duguid, 592 U.S. ___ (2021)
How the Case Got There
Noah Duguid sued Facebook in 2016 after receiving repeated automated texts warning of suspicious login activity on an account he didn’t own. He had never given Facebook his number and had no account with the company. Facebook’s system pulled his number from a stored database and sent the alerts. Duguid argued that made the system an autodialer. Facebook argued it didn’t, because no random or sequential number generator was involved. The Supreme Court agreed with Facebook.
What Changed After the Ruling
Federal courts began dismissing autodialer claims at much higher rates, both at the pleading stage and on summary judgment. Most TCPA suits had rested on the theory that dialing from a stored list was enough. That theory is gone.
A footnote in the opinion has produced its own line of disputes. Footnote 7 suggested in passing that a device might still qualify as an autodialer if it uses a random or sequential number generator to select numbers from a stored list, rather than to generate new numbers. Plaintiffs have pressed that reading, but most federal courts, including the Ninth Circuit, have rejected it. The emerging consensus is that the statute requires the device to generate numbers, not merely pick from a list.
A second open question is whether a system must actually use a number generator during the calls in dispute, or only have the capacity to do so. The statute uses the word “capacity,” and courts have not settled how far that reaches. The answer can decide whether a case survives a motion to dismiss.
What the TCPA Still Prohibits
Duguid narrowed one definition. It didn’t repeal the rest of the statute. Several protections remain fully in force whether or not a system meets the autodialer test.
Calls or texts using an artificial or prerecorded voice to a cell phone require the recipient’s prior express consent for non-marketing calls, and prior express written consent for telemarketing.4Federal Communications Commission. One-to-One Consent Rule for TCPA Prior Express Written Consent Frequently Asked Questions Prerecorded voice messages to residential landlines also require prior express consent, whether or not an autodialer is involved. Calls using an autodialer or a prerecorded voice to emergency lines, including 911, hospital emergency numbers, and poison control centers, are flatly banned, along with calls to hospital patient rooms and similar facilities.1Office of the Law Revision Counsel. 47 U.S.C. 227 – Restrictions on Use of Telephone Equipment
The National Do Not Call Registry operates independently of the autodialer definition. Businesses that sell goods or services by phone must scrub listed numbers from their calling lists.5Federal Trade Commission. National Do Not Call Registry FAQs The registry doesn’t cover charities, political calls, or survey firms.
AI-Generated Voices
In February 2024, the FCC confirmed that AI-generated voices, including voice-cloning, fall within the existing ban on “artificial or prerecorded” voice calls. The agency reasoned that AI voice technology “artificially simulates a human voice,” which is what the statute covers.6Federal Communications Commission. FCC Confirms That TCPA Applies to AI Technologies That Generate Human Voices Callers using AI voices need prior express consent before dialing, and the full range of TCPA penalties applies.7Federal Communications Commission. Implications of Artificial Intelligence Technologies on Protecting Consumers from Unwanted Robocalls and Robotexts
Revoking Consent
If you gave a company permission to call or text and want it to stop, you can revoke consent through any reasonable method that clearly communicates your request. Companies cannot force you into a single exclusive channel.8Federal Communications Commission. Rules and Regulations Implementing the Telephone Consumer Protection Act of 1991 (FCC 24-24) Certain methods count as automatically reasonable: replying to a text with words like “stop,” “quit,” “end,” “revoke,” “opt out,” “cancel,” or “unsubscribe”; using a key-press or voice option on an automated menu; or submitting a request through a website or phone line the company provides for opt-outs. Once you revoke, the company has no more than 10 business days to stop contacting you.
State Laws That Reach Further
Duguid interpreted the federal statute only. A growing number of states have their own telemarketing laws with broader autodialer definitions, and some of them cover exactly the conduct the Supreme Court held falls outside federal law. Some define “automated system” broadly enough to include any equipment that selects and dials numbers from a list. Others have added text messages to their prohibitions, removed damages caps in private suits, or set per-violation fines above the federal floor. At least one state allows penalties up to $20,000 per violation for telemarketing calls made without proper written consent.
If you receive unwanted automated calls or texts, your state’s law may give you stronger remedies than the federal TCPA now offers. Your state attorney general’s office or consumer protection division can point you to what applies where you live.
Penalties When the TCPA Does Apply
For conduct that still falls within the federal statute, the TCPA provides a private right of action in state court. You can sue for $500 per violation, or your actual monetary loss if greater. Willful or knowing violations can be trebled, bringing the ceiling to $1,500 per call or text.1Office of the Law Revision Counsel. 47 U.S.C. 227 – Restrictions on Use of Telephone Equipment The numbers scale quickly. A campaign of 10,000 unauthorized texts carries potential exposure of $5 million to $15 million, which is why the autodialer definition is worth so much money to corporate defendants.
Class actions remain common. Duguid has thinned out federal autodialer class actions by eliminating the stored-list theory, but claims based on prerecorded voices, lack of consent, and Do Not Call Registry violations continue to generate substantial litigation.
Legislation That Could Undo the Ruling
Some members of Congress have moved to rewrite the statute around the decision. The reintroduced “Protecting American Consumers from Robocalls Act” would add “or a list of telephone numbers” to the autodialer definition and require that a device dial numbers “successively without human intervention.” That change would cover systems dialing from stored contact lists and reverse the core holding of Duguid. As of early 2026, the bill has not advanced out of committee.