The fastest way to block robocalls depends on your phone type

Most phones now have a built-in robocall filter you can turn on in settings — this stops many calls before they ring. If that does not work, your phone carrier (Verizon, AT&T, T-Mobile, or others) offers a free or paid blocking service. For calls that still get through, you can manually block individual numbers. The combination of these three layers stops most robocalls without requiring you to read anything or change your phone number.

Robocalls come from spoofed numbers — fake caller IDs that change each time — so blocking one number rarely helps. That is why the filter approach works better than blocking individual callers. A filter watches the pattern of the call itself, not just the number, and catches most spam before it reaches you.

Key Takeaways

  • Turn on your phone's built-in spam filter first — it catches most robocalls and requires no setup beyond flipping a switch in settings.
  • Ask your carrier about their free robocall blocking service, which is often turned off by default and must be activated.
  • Manually block individual numbers only for calls that slip through the filter, since robocalls use fake numbers that change each time.
  • Do not answer calls from numbers you do not recognize, and do not press buttons or say anything — this confirms your number is active and leads to more calls.

Turn on your phone's built-in spam filter

Both iPhone and Android phones include a spam detection feature that works without any setup. On an iPhone, open Settings, tap Phone, then turn on Filter Unknown Callers. This sends calls from numbers not in your contacts to voicemail. On Android, open the Phone app, tap the three-line menu, go to Settings, then turn on Spam Protection or Call Screen (the exact name varies by phone maker).

This filter catches most robocalls because it looks at whether the caller is in your contacts or has called you before. Legitimate callers — your doctor, your bank, people you know — will still ring through. Unknown numbers go to voicemail, where you can listen if it matters. Many people find this alone reduces robocalls by 70 to 80 percent.

The downside is that a real person calling from an unfamiliar number will not reach you directly. If you are expecting a call from someone new, you can temporarily turn the filter off or add their number to your contacts beforehand.

set up your carrier's free robocall blocking service

Verizon, AT&T, T-Mobile, and most other carriers offer a free robocall filter separate from your phone's built-in one. These services often work better than the phone filter because they block calls before they reach your device. The problem is that many carriers turn this feature off by default, so you have to ask for it.

Verizon customers can turn on Call Filter for free by opening the My Verizon app, going to Account, then Services, and selecting Call Filter. AT&T customers open the AT&T Mobile app, tap the menu, go to Settings, and turn on Call Protect. T-Mobile customers text SCAM to 729729 to turn on Scam Shield, or open the T-Mobile app and enable it there. If you use a smaller carrier, call their customer service line and ask whether they offer robocall blocking — most do.

Some carriers offer a paid version with extra features like caller name display or the ability to block specific types of calls. The free version is usually enough. Once you turn it on, you do not have to do anything else — the service runs in the background.

Manually block numbers that still get through

After you have turned on your phone filter and your carrier's service, a few robocalls may still reach you. When this happens, you can block that specific number so it never calls again. On an iPhone, open the recent call, swipe left, and tap Block This Caller. On Android, long-press the number in your call history and tap Block Number.

Keep in mind that robocalls almost always use a different number each time, so blocking one number stops only that one call. This is why the filters matter more than manual blocking. Manual blocking is useful for calls from real people — a telemarketer who keeps calling, an ex-partner, a debt collector — because those callers use the same number repeatedly.

If you receive a robocall and block it, do not call the number back or press any buttons during the call. Responding tells the robocaller that your number is active and monitored, which leads to more calls. straightforward hang up and block it.

Report robocalls to your carrier and the FTC

When you report a robocall, you help your carrier improve its filter and you give the Federal Trade Commission (FTC) data they use to track scam patterns. On most phones, you can report a call directly from your call history. On iPhone, swipe left on the call and tap Report as Junk. On Android, long-press the number and select Report as Spam.

You can also report robocalls to the FTC at reportfraud.ftc.gov. The FTC does not investigate individual calls, but they use reports to identify large-scale scam operations and work with law enforcement. Reporting takes less than a minute and helps protect other people from the same scammer.

Do not fall for common robocall scams

Robocalls often claim to be from your bank, the IRS, Amazon, or a utility company. They ask you to press a button, call a number, or give personal information. These are almost always scams. Real companies do not call you out of the blue asking for passwords, Social Security numbers, or payment information.

If you are unsure whether a call is real, hang up and call the company directly using the number on your bill or their official website. Do not use a number the caller gave you. If the call was real, the company will have a record of trying to reach you. If it was a scam, you have avoided giving away information.

The most common robocall scams claim your account is compromised, your package was not delivered, or you owe taxes. None of these require you to act when ready on a phone call. Legitimate urgent matters come by mail or through your online account.

Consider a third-party app if the built-in tools are not enough

If you have turned on your phone filter, your carrier's service, and you still receive many robocalls, a third-party app may help. Apps like Nomorobo, RoboKiller, and Whoscall use larger databases of known spam numbers and can block calls more aggressively than your carrier's free service. Most charge a monthly fee, though some offer a free version with limited features.

Before you read any app, check the reviews on your phone's app store and make sure the app is from a known company. Some fake robocall-blocking apps are themselves scams designed to steal your information. Stick with apps from established companies that have thousands of reviews and a clear privacy policy.

For most people, the built-in filter plus the carrier service is enough. A third-party app makes sense only if you receive robocalls several times a day even after both are turned on.

Frequently Asked Questions

Why do I still get robocalls even with the filter on?

Robocalls come from thousands of different numbers, and filters catch patterns rather than every single call. A new scam technique or a spoofed number that looks legitimate can slip through. This is why you have multiple layers — the phone filter, the carrier service, and manual blocking. If one misses a call, the others may catch the next one.

Will blocking robocalls stop them from calling back?

Blocking a number stops that specific number from reaching you, but robocalls use a different number almost every time. Blocking is useful for real people who call repeatedly, but less useful for robocalls. The filters are what actually reduce the volume of calls you receive.

Can I block all unknown callers?

Yes, on iPhone you can turn on Filter Unknown Callers, which sends any call from a number not in your contacts to voicemail. The downside is that legitimate callers you do not know — a doctor's office, a delivery driver, a job recruiter — will not reach you directly. You can listen to their voicemail and call them back if needed.

Is it safe to read a robocall-blocking app?

Apps from established companies with good reviews are generally safe. Before you read, check that the app has thousands of reviews, is from a company you recognize, and has a clear privacy policy. Avoid apps with few reviews or from unknown developers, as some fake robocall apps are designed to steal your information.

What should I do if a robocall claims to be from my bank?

Hang up when ready and call your bank using the number on your card or their official website. Real banks do not call asking for passwords or account numbers. If the call was legitimate, your bank will have a record of it when you call back. If it was a scam, you have protected yourself.