How to Actually Stop Spam Calls (And Why the Usual Advice Doesn’t Work)

A reader wrote to tell me she gets sixteen spam voicemails a day.

Not sixteen calls. Sixteen voicemails.

She blocks the numbers. She never answers. She has her phone set to only ring for people she knows. She did everything the internet told her to do, and every evening she sits down and listens to all sixteen messages, one at a time, deleting as she goes.

Why listen at all? Because somewhere in that stack there might be one real message from a real person. Her doctor. Her pharmacy. Her son. And there is no way to know which one without playing every single one.

So she does homework every night. For criminals.

If that sounds even a little familiar, this guide is for you. We are going to cover why the advice you have been given mostly does not work, and then the short list of things that actually do.

One promise up front, so nobody feels cheated at the end. Nothing here makes your phone go completely silent. Anyone who tells you they can do that is selling something. What these steps do is shrink the pile down to something you can glance at instead of something you have to work through.

That is a smaller promise. It is also a real one.

Part One: Why the usual advice fails

“Just block the number”

This is the one everybody does, and it feels wonderful. It is also about as effective as yelling at weather.

The number on your screen is not necessarily the number that is really calling. Scammers can fake it. The industry term is Caller ID spoofing, which is a fancy way of saying they get to write whatever they want in the “from” field.

Think of the return address on an envelope. Anyone can write anything they like up in that corner, and the mail still shows up.

So when you block a number, you have successfully blocked one envelope.

Here is the scale of the problem. A single robocall campaign this past July made more than forty million calls, using thousands of different numbers. One operation. Thousands of numbers.

You have one thumb.

Does blocking ever make sense? Yes, for one specific job: a real person or a real company that keeps calling you and that you want to stop. A pushy salesman, an ex-contractor, your cousin’s timeshare guy. For that, blocking works exactly as advertised, and we have a full walkthrough on how to block and unblock a number on your smartphone.

Just do not expect it to do anything about robocalls.

“Set your phone to only accept known callers”

This is the sneaky one, because it looks like it is working. It is also exactly why our reader has sixteen voicemails instead of sixteen rings.

Here is the important part: silencing a call usually does not stop the caller from leaving a voicemail. On the iPhone, for example, Apple’s Silence option specifically sends unknown callers to voicemail.

So when your phone turns a call away, that call does not vanish into a hole. It gets handed straight to voicemail, where the recording leaves its message like nothing happened.

Your phone goes peaceful. Your voicemail box fills up.

You have not stopped the calls. You have moved them from a place where you could ignore them to a place where you have to go collect them.

Worth remembering too: your pharmacy, your doctor’s office, and the man coming to fix the air conditioner are all unknown numbers.

We have written about the iPhone’s Silence Unknown Callers setting before, and it does have its uses. But if your voicemail is drowning, this setting is a likely reason why. There is a better option further down this page.

“Get on the Do Not Call list”

Almost everybody is on it. Almost everybody assumes it failed.

It did not fail. It is doing precisely what it was built to do, which is less than you were led to believe.

The Do Not Call registry is a list of people who have politely asked not to be bothered. It carries weight with companies that follow the law. The operation placing forty million illegal calls is not cross-referencing your name against a federal registry out of respect for the process.

Keep it anyway. Signing up takes two minutes at donotcall.gov, it is free, and it does trim the legitimate telemarketers. Just move it out of the “protection” column and into the “tidying up” column.

“Never say the word yes on the phone”

You have had this one forwarded to you nine times. The claim is that scammers record you saying “yes” and use the recording to approve charges in your name.

Snopes has been chasing that story for years and has never turned up a single confirmed case of it happening to anybody.

And once you say it out loud, you can hear the problem. We are imagining a criminal who will cheerfully forge charges, steal your identity, and empty your checking account, but who would never dream of just saying the word “yes” himself.

Hang up anyway, though. Just for the real reason, which is better advice than the myth ever was. Answering at all tells them a live human being picks up at this number, and that makes your number worth more to the next person who buys the list.

Same goes for pressing a button to be removed. The FTC’s own guidance is that pressing it gets you more calls, not fewer.

Say nothing. Hang up.

Part Two: What actually works

Here is the pattern in everything above. Every one of those moves happens after the call has already reached you, and not one of them stops the next one from coming.

The things that work sit further upstream.

1. Turn on the spam filter at your phone company

This is the big one, it is free, and on most accounts it is sitting there switched off right now.

Why it works when blocking doesn’t. Your phone company does not care what is written on the envelope. It can see the whole post office.

An operation placing forty million calls in a month, four seconds at a time, does not look like a person having a day. It does not matter which number it is wearing that morning. The behavior gives it away, and your phone company is the only one standing in a spot where the behavior is visible, because every one of those calls crosses their wires.

That is the difference. Blocking filters by number. Your carrier filters by behavior.

How to turn it on:

• T-Mobile: dial #662# from your phone. That is the whole job. Dial #787# first if you want to check whether it is already on, and #632# turns it back off. (On the keypad those spell ONB, STS and OFB, for “on block,” “status” and “off block.” Somebody at T-Mobile is extremely pleased with themselves, and honestly, fair enough.)
• AT&T: download the free ActiveArmor app and turn on spam blocking.
• Verizon: download the free Call Filter app.
• Anyone else: call your carrier and ask what they offer for spam calls. Most of them have something and will not bring it up unless you ask.

Then change the one setting that matters. Find the option that decides what happens to a suspected spam call, and set it to block rather than send to voicemail.

This matters more than anything else on this page. On Verizon, voicemail is the default. Which means you can turn on spam filtering, feel good about it, and still end up with a voicemail box full of Cornelius. Sending spam calls to voicemail is how our reader got sixteen of them.

2. Let your phone answer the calls you don’t recognize

This is the one that fixes the actual problem.

Remember the trouble with “known callers only”: the call still lands in voicemail, so you still have to go collect it. Screening is the opposite move.

Your phone does not immediately send the call away. It answers first and asks who is calling and why. Depending on your phone, you can see the caller’s answer before deciding whether to pick up—and some phones can automatically end calls they identify as spam.

A real person can explain why they’re calling. A robocall may get caught by the screening system, or at least reveal itself before you ever have to answer.

On an iPhone (iOS 26 or newer): go to Settings → Apps → Phone → Screen Unknown Callers, and choose “Ask Reason for Calling.”

On a Google Pixel: open the Phone app → Settings → Spam and Call Screen (or Call Screen) → Call Screen and choose your automatic screening settings.

On newer Samsung Galaxy phones: if your phone has One UI 8.5 or newer, open Phone → Settings → Call screening. You can also turn on Auto screen calls.

Other Android phones vary by manufacturer. Look in your Phone app settings for “Call Screen,” “Call Screening,” or a similar option.

If your iPhone is a bit older, you have a close cousin called Live Voicemail, which transcribes a message on your screen while the person is still leaving it, so you can pick up mid-sentence if it turns out to matter. We walked through that one in Remember Answering Machines? They’re (Sort Of) Back!.

If none of that is available, check whether your phone or carrier offers voicemail transcription or Visual Voicemail. If it does, your messages may appear as text so you can scan them instead of listening to every recording. Availability—and sometimes cost—depends on your phone and carrier.

3. Stop handing out your real number

Everything so far deals with calls that are already coming. This is about where they come from in the first place.

The warranty card. The store loyalty signup. The “what’s your number for the receipt.” Every online form with a phone box on it.

A lot of those companies sell that list. That is how you got here.

So keep a second number, and hand that one out instead. Google Voice will give you one free. It rings on your regular phone like any other call, and you can put it on every form for the rest of your life without a second thought.

Yes, that does mean Google has it. That is a fair trade in our book: one company you picked on purpose, instead of forty you never heard of.

Then keep your real number for people who know your name.

4. Get your number off the people-search sites

This is the slow one, so save it for a rainy afternoon.

There is an entire industry that collects your name, your town, your age and your phone number, publishes it on a website, and sells it to anyone who asks. These are called data brokers and people-search sites.

Try this: type your own phone number into Google. If your name and your town come back at you, you have just found one of them. That is where the calling lists get restocked.

Your options:

• Do it yourself. Every one of those sites has an opt-out page. It is free and it is tedious. Start with the big ones (Whitepages, Spokeo, BeenVerified, Radaris, Intelius), and expect to spend an afternoon.
• Pay someone. Removal services will do the rounds for you, generally around a hundred dollars a year.

Be realistic about this one. Neither route catches everything, and these sites relist people as new public records roll through. You are buying quiet, not a clean slate.

What to expect afterward

Do the first two things on this list and most people see the pile shrink noticeably.

You will still get some. A filter that caught every single spam call would also, sooner or later, catch your cardiologist. Every one of these tools is making a judgment call, and you want it erring slightly toward letting things through.

That is the trade, and it is worth taking with both hands.

The quick version

What you were told	Does it work?	Do this instead
Block the number	Not for robocalls	Turn on your carrier’s spam filter, set to block
Only allow known callers	No, voicemail still fills	Screen unknown callers instead
Join the Do Not Call list	Only for legitimate companies	Keep it, but do not count on it
Never say “yes”	Myth	Hang up without speaking

One last thing

Our reader listened to all sixteen messages every night because she was scared one of them was her doctor.

She was not trying to beat anybody. She was trying not to miss somebody.

Not one item on this list is really about silence. Every one of them is a way of getting that pile checked by something that is not you.

The calls were never going to stop. What can stop is you being the one who goes through them.