Tech Reference

How to mute spam calls on your iPhone with the 'Silence Unknown Callers' feature

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You can silence calls from unknown numbers. Apple
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For as advanced as phones have gotten, it sometimes seems like we receive more spam and robocalls than ever. And the data backs this up: Americans are dealing with a flood of unwanted spam calls.

There are lots of ways to deal with spam calls, from blocking their numbers to using third-party filtering apps. But the easiest thing to do is ignore them — and if you have an iPhone, you've got a useful feature that can help you out.

How to use 'Silence Unknown Callers' to mute spam calls on your iPhone

No matter your phone carrier, every iPhone has a feature called "Silence Unknown Callers." When this is turned on, your phone won't ring for calls from numbers you don't have saved.

In other words, when a spam number calls you, you won't know. Your iPhone won't make a sound, and after a few moments, it'll just send the caller to voicemail. Afterwards, you'll see the number show up on your recent call list.

You'll still hear rings for numbers you have saved in your Contacts list, numbers you've called or texted before, and "Siri Suggestions" — usually phone numbers that you've seen in an email or text message recently. Additionally, the feature will turn itself off for 24 hours after you call an emergency number like 911.

If you're dealing with a deluge of calls from people you don't know, Silence Unknown Callers is a great way to keep yourself sane. Here's how to turn it on.

1. Open your iPhone's Settings app and scroll down to tap Phone.

2. Near the bottom of this page, tap Silence Unknown Callers.

3. Tap the toggle switch to turn it on.

The Silence Unknown Callers option on an iPhone.
Flip the switch to the right to turn it on.  William Antonelli/Insider

From now on, all unknown callers will be automatically muted. If you want to turn the feature off again, just come back to this menu.

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ExperienceWilliam joined Business Insider in 2019 to help found Tech Reference, a vertical dedicated to answering the internet’s most common questions about the gadgets they buy. In that role, he helped grow the vertical into a powerhouse that attracted over 20 million pageviews a month. He also wrote and edited one of Business Insider’s most successful stories: How to take a screenshot on Windows.William later became one of Business Insider's lead consumer tech reporters, writing roundups and reviews about gadgets ranging from smartphones to gaming PCs. He also established key industry contacts at brands like Apple, Google, Nintendo, and more. He’s also cited on the Wikipedia page for Among Us, an honor above all others.William’s work for Business Insider has included reviewing the best gaming laptops, publishing previews of new Nintendo games and consoles, and comparing Apple’s latest releases so readers know what’s worth their money. Across all assignments, he’s been praised for his depth of knowledge and research skills.In addition to his work at Business Insider, William’s writing has appeared in outlets like The Guardian, Polygon, Thomson Reuters’ Context, and more. He's also a regular guest on TV stations like CBS and NBC, where he provides expert analysis on AI, consumer tech, and Silicon Valley moguls.Why you can trust WilliamWilliam believes the goal of journalism should be to tell the truth, not sell products. In his reviews, William never hesitates to call out a product’s flaws, but he also has no issue complimenting features that genuinely add value.When reviewing a product, William doesn’t test it in a vacuum. He tries to incorporate each product into his daily routine to get a better sense of how it’ll work for the everyday user. And when writing, he focuses on reader comprehension. He’s talented at explaining complicated concepts in ways that all readers can understand, without losing depth or nuance — or his distinctively engaging voice.Expertise
  • Artificial Intelligence (AI)
  • Consumer Technology (Laptops, PCs, video games and gaming consoles, smartphones, more)
  • Social Media (TikTok, X, Meta, more)
  • Internet Culture (Memes, influencers, viral trends)
  • Disinformation
EducationWilliam graduated from the State University of New York at Geneseo in 2018. There, he studied English, communications, and adolescent education, alongside reporting news for the university’s radio and TV stations.Outside workWhen he’s not reporting, you can usually find William biking through Central Park, playing video games, or at home listening to music and writing fanfiction. He’s also a co-manager of the New York Mandolin Ensemble, one of NYC’s premier string orchestras.You can contact him at w.antonelli322@gmail.com, visit his official website at williamantonelli.com, or follow him on Twitter @DubsRewatcher and BlueSky @wantonelli.bsky.social.