How to block your number from spam calls

  • You can stop spam and robo calls by blocking numbers on Android or using Do Not Disturb on iPhone.
  • To block spam calls and report telemarketers, you can join the National Do Not Call Registry.
  • To screen and block spam calls, you can also use your phone carrier or download a third-party app.

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. 

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.

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.

Enable Silence Unknown Callers Kyle Wilson/Insider

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.

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. 

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 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.

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. 

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 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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How do I block all spam calls on my phone?

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.

Does 662 block spam calls?

You can always turn on Scam Block without the Scam Shield app. To do so, dial #662# from your T-Mobile phone. To disable it, just dial #632#.

How do I prevent my number from being marked as spam?

Below are some suggestions to reduce your chances of getting a number marked as spam..
Call responsibly. ... .
Do not hang up on people if you are running a dialer. ... .
Make sure people can reach you if they call back..
Ensure you are not making outbound marketing calls to numbers on the federal government's Do Not Call Registry..

How do I block spam callers on my iPhone?

Avoid unwanted calls on iPhone.
Tap Favorites, Recents, or Voicemail. Tap. next to the number or contact you want to block, scroll down, then tap Block this Caller..
Tap Contacts, tap the contact you want to block, scroll down, then tap Block this Caller..