Quick answer: The single most effective habit is to not answer unknown numbers and never speak or press a key when you do. Any response confirms your line is live and increases the calls. Beyond that, turn on your carrier’s free blocking service and your phone’s built-in silencing feature. The Do Not Call Registry stops legitimate telemarketers but has no effect on criminals, which is what most robocalls now are.
Key Takeaways
- Never speak or press a key on a robocall; any response confirms your line is active
- Silencing all unknown callers is the single most effective free setting
- Blocking individual numbers rarely helps because caller ID is usually spoofed
- The Do Not Call Registry stops legal telemarketers but has no effect on scammers
- Gift cards, wire transfers, and crypto demands are reliable signs of fraud
Start with what you do on the call itself
Tools matter less than behavior, because every tool has gaps and the callers adapt.
Do not answer numbers you do not recognize. Legitimate callers leave voicemail. Answering confirms a working number, and confirmed numbers get sold and called more.
If you answer, say nothing and hang up. Automated systems detect a human voice and flag the line. Even “hello” is a signal.
Never press a key, including the one offered to be removed from the list. On an illegal operation that button confirms you are a real person who engages.
Do not call back. Some scams route callbacks to premium-rate numbers that charge by the minute.
Ignore the area code. Neighbor spoofing makes calls appear local. A familiar prefix means nothing.
Tools ranked by how much they help
| Tool | What it does | Cost |
|---|---|---|
| Silence unknown callers | Sends non-contacts straight to voicemail | Free, built in |
| Carrier blocking app | Labels or blocks known spam numbers | Usually free tier |
| Third-party apps | Larger databases, more control | Often subscription |
| Do Not Call Registry | Stops legal telemarketers only | Free |
| Blocking individual numbers | Nearly useless against spoofing | Free |
Silencing unknown callers is the strongest single setting. On iPhone it is in Settings under Phone; on Android it appears in the Phone app settings, with wording that varies by manufacturer. Calls from anyone not in your contacts go to voicemail without ringing.
The tradeoff is real: you will miss legitimate calls from a doctor’s office, a delivery driver, or a job recruiter. Check voicemail if you are expecting something.
Blocking numbers one at a time does almost nothing, because the number shown is usually spoofed and changes on every call. People spend a lot of effort here for very little return.
What the Do Not Call Registry does and does not do
Registration is free at donotcall.gov and does not expire. It applies to legitimate telemarketing companies, which face penalties for calling registered numbers.
It does nothing against fraud operations. A criminal running a fake IRS scam is not consulting a compliance list.
That gap explains a common frustration. People register, see no change, and conclude the registry is broken. It is working as designed; the problem is that the composition of unwanted calls shifted toward outright scams.
Register anyway. It takes a minute and removes one category of calls.
Signs it is a scam rather than a nuisance
Nuisance calls waste time. Scam calls cost money. These patterns indicate the second kind.
- Urgency plus threat. Arrest, deportation, account closure, or utility shutoff within hours.
- Unusual payment demands. Gift cards, wire transfers, cryptocurrency, or payment apps. No government agency accepts these.
- Claiming to be a government agency by phone. The IRS initiates contact by mail, not by calling to demand immediate payment.
- Asking you to move the conversation. Requests to switch to a messaging app or install remote-access software.
- Secrecy. Telling you not to discuss it with family or your bank is a hallmark of fraud.
When in doubt, hang up and call the organization back using a number you look up independently, never one the caller provides.
Reducing exposure over time
Fewer places holding your number means fewer calls.
Use a secondary number for online forms, contests, and store signups. Free options exist and can be given out freely.
Be selective about giving your number at checkout. Retailers often ask for it as a matter of routine, and it frequently ends up in marketing databases.
Report calls at donotcall.gov and reportfraud.ftc.gov. Individual reports rarely produce individual results, but aggregated data drives enforcement against the larger operations.
If your number has been circulating for years, expect improvement to be gradual rather than immediate.
FAQ
Why do calls come from my own area code? Neighbor spoofing fakes a local number to increase the chance you answer. It is not actually a local caller.
Does saying “remove me from your list” work? Only with legitimate telemarketers. With scam operations it confirms your line is active.
Should I block each number? It rarely helps, since spoofed numbers change constantly. Silencing all unknown callers is far more effective.
Are paid blocking apps worth it? They can help with volume, but no app catches everything. Try free carrier tools first.
Does the Do Not Call Registry expire? No. Registration is permanent unless you remove your number.
For scam calls that reach the point of identity theft, see our guide to reporting identity theft.
Sources
- FTC: How to stop unwanted calls
- National Do Not Call Registry
- FCC: Stop unwanted robocalls and texts
Last updated: August 21, 2026. Written by the InfoBrief Editorial team. Rules change; confirm with the official source before acting. See our disclosure.