How to Stop Robocalls
Robocalls are automated and illegal when they break the rules — and the most powerful response is to never engage. Here is how the system works and how to report the worst offenders.
A robocall is any phone call that delivers a prerecorded or computer-generated message, dialed automatically by software rather than a person. Some are legal — appointment reminders, school closings, genuine debt collectors with your consent — but the ones that flood most phones are illegal: scams, fake “extended warranty” pitches, and impostor calls pretending to be the IRS, Social Security, or your bank. This guide is specifically about those automated and prerecorded calls and, crucially, how to report them so regulators can act. If you also want general per-number blocking advice for any unwanted caller, our companion guide on blocking spam calls covers the device-level basics.
Key takeaways
- Hang up — never press a key. Interacting confirms your number is live and increases calls.
- STIR/SHAKEN is the FCC-mandated framework that verifies caller ID and helps carriers flag spoofed calls.
- The FTC Do Not Call Registry stops legal telemarketers; it does not stop criminals, so pair it with blocking.
- Report robocalls at DoNotCall.gov and the FCC — your reports drive enforcement.
What counts as a robocall
If you pick up and hear a recorded message, or a pause followed by a script, you are almost certainly on a robocall. Under U.S. rules, prerecorded marketing calls to your phone generally require your prior written consent — so an unsolicited recorded sales pitch is, by definition, illegal. The FTC is blunt about it: if you get a robocall trying to sell you something and you did not give written permission, the call is illegal and the seller is likely a scammer. That framing matters, because it tells you the right move is not to negotiate, opt out, or listen — it is to hang up and report.
“Press 1 to be removed” is a trap. The FTC warns that responding to a robocall's prompts — pressing a number, saying a word, or calling back — signals that a real person answered. That makes your number more valuable and leads to more calls. The only safe response to an unwanted robocall is to end it.
Why you must never engage
Robocall operations run on probability. They dial enormous numbers of lines and only need a tiny fraction of people to react. Every interaction — answering, speaking, pressing a key — tightens that targeting and can move your number onto a “verified live” list that is resold to other scammers. Even saying “yes” can be risky, as recordings of your voice have been used to authorize charges. Treat silence and a fast hang-up as your strongest tools. Then back them up with the systemic protections below.
STIR/SHAKEN: caller ID you can trust
STIR/SHAKEN is a set of technical standards, mandated by the FCC, that lets carriers cryptographically sign and verify the caller ID on calls as they cross between networks. When a call is properly “attested,” your carrier can be confident the displayed number really belongs to the caller; when it cannot be verified, the carrier can label it as Spam Likely or block it outright. This framework is the backbone of the verified-caller labels you now see, and it is why network-level filtering catches spoofed numbers your phone alone might miss. Make sure your carrier's free filtering (AT&T ActiveArmor, Verizon Call Filter, T-Mobile Scam Shield) is switched on so you benefit from it.
The FTC Do Not Call Registry
Adding your number to the National Do Not Call Registry at DoNotCall.gov is free, permanent, and tells legitimate telemarketers to leave you alone — legal sales callers must stop within 31 days. It is an important first step, but be clear-eyed about its limits: criminals running illegal robocalls already ignore the law, so the registry will not stop them. Think of it as removing the legal noise so that anything still automated and unsolicited is a clear red flag you can confidently block and report.
| Tool | Stops legal telemarketers? | Stops illegal scams? |
|---|---|---|
| Do Not Call Registry | Yes | No |
| STIR/SHAKEN + carrier filter | Partly | Often |
| Call-blocking app | Yes | Often |
| Hanging up / not engaging | n/a | Reduces targeting |
Call-blocking apps
Beyond your carrier and the built-in filters, dedicated call-blocking apps maintain large, frequently updated databases of known robocall numbers and use heuristics to flag new ones. Reputable options screen calls in real time and can auto-decline or send suspected robocalls to voicemail. The FTC's advice is to choose well-reviewed apps and to understand what data they access, since a blocking app needs visibility into your calls. Used alongside carrier filtering, a good app meaningfully reduces the trickle that slips through. For the underlying device settings these apps build on, revisit our spam-call blocking guide.
Layer, do not duplicate. Carrier filtering plus the built-in phone filter is enough for most people. Add a third-party app only if robocalls still get through — and pick one with a clear privacy policy, since it will see your call activity.
How to report robocalls
Reporting is what turns your annoyance into enforcement. Report illegal sales robocalls and Do Not Call violations to the FTC at ReportFraud.ftc.gov or DoNotCall.gov, including the number that appeared and the date. For broader unwanted-call complaints, the FCC accepts reports through its consumer complaint center. These reports feed the data that regulators and carriers use to identify, fine, and shut down the worst operations. While one report will not stop your phone ringing tomorrow, aggregated reports are exactly how major robocall campaigns get traced and penalized. Pair this habit with strong two-factor authentication so that even a convincing impostor call cannot lead to a compromised account.
Frequently asked questions
Are all robocalls illegal?
No. Purely informational robocalls, such as appointment reminders, flight changes, or school closings, are generally allowed, and some calls you consented to in writing are legal. The illegal ones are unsolicited prerecorded sales calls and scams made without your written permission. If a recorded message is trying to sell you something and you never agreed to it, the FTC considers it illegal.
Does pressing a number to opt out work?
No, and it usually backfires. Following a robocall's prompt to be removed simply confirms a real person is on the line, which makes your number more valuable to scammers and leads to more calls. The FTC advises hanging up immediately rather than interacting with any robocall menu or instruction.
What is STIR/SHAKEN in simple terms?
It is an FCC-mandated system that lets carriers digitally verify that the caller ID shown on a call is genuine. When a call cannot be verified, the carrier can flag it as likely spam or block it. It is the reason you see verified-caller labels and why spoofed numbers are increasingly caught at the network level.
Where do I report a robocall?
Report illegal sales robocalls and Do Not Call Registry violations to the FTC at ReportFraud.ftc.gov or DoNotCall.gov, and file unwanted-call complaints with the FCC's consumer complaint center. Include the number displayed and the date. These reports feed the enforcement data regulators use to fine and shut down robocall operations.
Sources & further reading
- FTC — How to stop unwanted calls
- FCC — Combating spoofed robocalls with STIR/SHAKEN
- FTC — National Do Not Call Registry
This guide is independently produced. We reference primary documentation from device makers and security authorities (NIST, CISA). Tudug is reader-supported and may earn from ads.