How to stop spam calls on your cell phone

Robocalls just won't go away. Try as you might to ignore the ring of telemarketers, the spam always seems to return, no matter what you do. 

While the Federal Communications Commission has beefed up its own policies around spam and robocalls, it's still mostly on you to stop these annoyances. 

Whether you have an iPhone or Android phone, here's how you can block spam calls and robocalls for good. 

Note: An Insider survey in February 2021 found that 46% of Americans say they receive spam calls on their cell phone every single day.

How to stop spam calls

 

  • Don't pick up calls from unknown or unrecognized numbers. Answering robocalls confirms to spammers that your number is real, which may result in more calls. If you pick up accidentally, hang up immediately.
    • Never give out personal information. Even if the caller says they are from a government agency or trusted institution, don't ever give out social security numbers, bank accounts, passwords, or any other information. 
  • Talk with your service provider. They may have apps or other tools that could help you block unwanted calls.

How to block spam calls on iPhone

Spam calls on iPhones can be blocked by either blocking individual numbers or filtering unknown callers.

Block individual numbers

To block a phone number on your iPhone, locate the robocall number on your Phone app's Recent calls list. Next, tap the "i" icon to the right of the number and select "Block Contact" from the options list.

Screenshot of the block contact option on iPhone.

You can block all future calls from known spam calls by blocking individual numbers.Dave Johnson/Insider

Filter unknown callers

1. Open the Settings app.

2. Tap on Phone and select Silence Unknown Callers.

Screenshot of Silence Unknown Callers option

Enable Silence Unknown CallersKyle Wilson/Insider

Quick tip: Turning on Do Not Disturb mode can also help by silencing all notifications that you don't explicitly allow.

How to block spam calls on Android

Much like on iPhone, you can also block spam calls on Android.

Block individual numbers

To block a number on Android, tap and hold the number in your recent calls list until a menu appears. Then select whatever variation of "Block/Report Spam" is available.

Screenshot of the Android blocked numbers screen with “add a number” option highlighted.

You can add a number or block all unknown numbers.Abbey White/Insider

Any phone with the Android 11 update now has access to expanded robocall identification and prevention that helps call-screening apps more effectively sort out robocalls from real ones. 

Filter unknown callers

Some Android devices allow you to block unknown calls as well. Like on iPhones, this is typically found in the Settings app under Phone.

Other ways to block spam calls

While the above can be effective, there are other ways to address spam calls.

Join the US national Do Not Call registry

The National Do Not Call Registry takes you off of the public lists that telemarketers use to make their mass calls.

While joining won't stop charities, political groups, debt collectors, and surveys from contacting you, it may reduce the number of spam calls you get. It also lets you report unwanted spam calls to the Federal Trade Commission. 

Screenshot of the US national Do Not Call registry.

Add yourself to the National Do Not Call Registry to stop getting spam calls from reputable marketers.Dave Johnson/Insider

You can register your number on the Do Not Call list at no cost by calling 1-888-382-1222 (voice) or 1-866-290-4236 (TTY). You can also do it online by following the steps below: 

1. Go to DoNotCall.gov and hit the "Register" link.

2. Enter your phone number without hyphens (you can register three at a time, in fact) and your email address (for confirmation).

3. Go to your email and find the message from [email protected] within 72 hours of your submission.

4. Follow the steps within the email to complete the registration process.

Use tools developed by phone carriers

Most cell phone carriers have a number of free or low-cost tools available to help you automatically block robocalls and protect you from spam.

Screenshot of AT&T’s Call Protect app.

Anti-robocall apps, like AT&T's Call Protect (pictured), will block known spam callers and try to flag suspected robocalls as "suspicious," dramatically reducing the number of marketing calls you answer.Dave Johnson/Insider
  • AT&T: The Call Protect app blocks both potential spam and fraud calls, while also offering nuisance warnings labels. You also have access to a personal spam-blocking list and the ability to block any unknown callers. 
  • Sprint/T-Mobile: T-Mobile — which now owns Sprint — offers Scam Shield, a free service that blocks any calls from numbers the carrier has recognized as a nuisance. Just dial #ONB# (#662#) from your phone to turn it on, or download it in the app store. 
  • Verizon: Call Filter offers spam detection and filtering, a blocked call log, and the ability to report a spam call. It's free for customers, with the premium version, Call Filter Plus, priced at just $2.99 each month for a single line or $7.99 a month for 3 or more lines. 

Quick tip: If your carrier isn't listed above, call their customer service line to find out what robocall and spam-blocking tools they have available.

Download third-party call blocker apps

Another way to stop robocalls is to install a call-blocking app. Such apps actually intercept and answer calls for you, so they never ring through and annoy you, or expose you to a scam.

Many of these apps also actively collect data on spammers, blocking them permanently once they have been identified —so by using a robocall blocking app, you're helping not just yourself but other callers.

However, it is important to use a legitimate app and to conduct your own research. In order to function, these apps need access to both your call logs and contacts, which is sensitive information. 

Here are two reliable apps you can try that are available on iPhone and Android:

  • Nomorobo costs just $1.99 per month, with a free version for VoIP landlines.
  • RoboKiller costs $2.99 per month, and it comes with a truly delightful feature: it deploys its own bots who use carefully crafted pre-recorded messages to keep scam callers on the line as long as possible, wasting their time and preventing them from calling others.

Steven John

Freelance Writer

Steven John is a freelance writer living near New York City by way of 12 years in Los Angeles, four in Boston, and the first 18 near DC. When not writing or spending time with his wife and kids, he can occasionally be found climbing mountains. His writing is spread across the web, and his books can be found at www.stevenjohnbooks.com.

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Dave Johnson

Freelance Writer

Dave Johnson is a technology journalist who writes about consumer tech and how the industry is transforming the speculative world of science fiction into modern-day real life. Dave grew up in New Jersey before entering the Air Force to operate satellites, teach space operations, and do space launch planning. He then spent eight years as a content lead on the Windows team at Microsoft. As a photographer, Dave has photographed wolves in their natural environment; he's also a scuba instructor and co-host of several podcasts. Dave is the author of more than two dozen books and has contributed to many sites and publications including CNET, Forbes, PC World, How To Geek, and Insider.

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Kyle Wilson

Kyle Wilson is an editor for the Reference team, based in British Columbia, Canada. Outside of Insider, his work has also appeared in publications like The Verge, VICE, Kotaku, and more. He periodically guest co-hosts the Saturday tech show "Tech Talk" on the iHeartRadio station C-FAX 1070. Feel free to reach out to him on Twitter, where he can be found most of the time, @KWilsonMG.

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Why am I getting so many spam calls on my cell phone?

The main reason people are getting more spam calls is the sales spammers make through these calls are worth their while. Meanwhile, there's hardly any downside for scammers and spammers: Their identities are easily concealed over a call, and there is a general lack of legislation that would prevent these activities.

How do I stop automatic spam calls?

On your device, open the Phone app . Spam and Call Screen. Turn See caller & spam ID on or off. Optional: To block spam calls on your phone, turn on "Filter spam calls." You don't get missed call or voicemail notifications, but filtered calls are in your call history, and you can check your voicemail.