Silence Unknown Callers on iPhone and Android: How to Turn It On or Off (and What It Really Does)

To silence unknown callers on an iPhone running iOS 26, open Settings > Apps > Phone, scroll to Screen Unknown Callers, and choose Silence. Calls from numbers that aren't in your contacts stop ringing and go straight to voicemail. To turn it off, pick Never in the same menu. A third option, Ask Reason for Calling, has your iPhone ask the caller who they are before it rings you.

Android has no single equivalent switch. On a Pixel, the closest match is Call Screen, which can screen first-time callers automatically. On Samsung and in the Google Phone app, the "block unknown numbers" switch only blocks callers with a hidden or private caller ID, not every number outside your contacts.

If you run a business from your phone, weigh that before you flip the switch. The setting that kills robocalls also silences the customer who found you on Google five minutes ago.

How do I silence unknown callers on iPhone?

The menu changed in iOS 26. The current path, from Apple's support page:

1. Open Settings, then tap Apps.
2. Tap Phone.
3. Scroll to Screen Unknown Callers.
4. Choose one option:
   • Never: calls from numbers you haven't saved ring normally.
   • Ask Reason for Calling: the caller is asked why they're calling before your iPhone rings.
   • Silence: calls are silenced and sent to voicemail.

You can set the same option for FaceTime under Settings > Apps > FaceTime.

On iOS 18 and earlier

Older versions show a single switch instead of the three-way choice. On iOS 18 it's Settings > Apps > Phone > Silence Unknown Callers. On iOS 17 and earlier, the Phone settings sit directly in Settings without the Apps step: Settings > Phone > Silence Unknown Callers.

How to turn off Silence Unknown Callers

1. Open Settings > Apps > Phone.
2. Tap Screen Unknown Callers.
3. Select Never.

On iOS 18 and earlier, turn the Silence Unknown Callers switch off. Then call yourself from a number that isn't in your contacts and confirm it rings.

If calls still go to voicemail after you turn it off, the cause is something else. Check Focus, call forwarding, and blocked numbers using our guide on why calls go straight to voicemail.

What does Silence Unknown Callers actually do?

The setting judges a caller on one thing: whether your iPhone already knows them. It never checks whether the call is spam.

Who still gets through

According to Apple's troubleshooting article, a call rings through if the number is:

• saved in your Contacts,
• in your Recents (you called them recently),
• shared with you in Mail, or
• one that texted you from that number.

Who gets silenced

Everyone else: the dentist's office calling to confirm, the delivery driver, your kid's school on a new line, and every first-time customer.

What happens to a silenced call

• The phone doesn't ring or vibrate.
• The caller hears it ring, then reaches your voicemail.
• You see the call in your call list and any voicemail they left.
• With Call Filtering > Unknown Callers turned on, missed calls and voicemails from unknown numbers move into a separate Unknown Callers list in the Phone app. It's an easy list to forget.

Apple also lists two exceptions: if you call emergency services, call screening turns off for 24 hours so callbacks reach you, and calls aren't screened while you're roaming.

What does "Ask Reason for Calling" do?

This is the iOS 26 Call Screening feature. When an unknown number calls, your iPhone answers silently and asks the caller for their name and the reason for the call. You then see their answer on screen and decide whether to pick up. Robocalls usually hang up at the question.

It beats plain silencing, with trade-offs:

• Callers have to talk to a machine first. Some real customers hang up when an automated voice answers.
• You still have to be free to read the screen and pick up. If you're driving, on a ladder, or with a client, the call goes to voicemail anyway.
• It doesn't book anything. It tells you who is calling. It doesn't take the job details or put a time on your calendar.
• On iOS versions earlier than 17, Apple notes Live Voicemail must be on for call screening to work.

Silence unknown callers on Android

Google Pixel: Call Screen

Pixel phones can screen calls automatically before they ring:

1. Open the Phone app.
2. Tap More > Settings > Spam and Call Screen (on some versions just Call Screen).
3. Tap Call Screen.
4. On Pixel 7 and newer, turn on Automatically screen calls and choose which callers to screen: spam, possibly faked numbers, or first-time callers. On Pixel 6 and older, pick the caller types under Unknown call settings.

Google's help page says automatic screening works in the US, Canada, UK, Ireland, and Australia. If a screened caller isn't spam, your phone rings and shows you how the caller answered. Spam calls are hung up.

Google Phone app on other Android phones

In the Phone app, tap More > Settings > Blocked numbers and turn on Unknown. This blocks calls from private or unidentified numbers only. Regular numbers that aren't in your contacts still ring.

You can also turn on spam filtering under Settings > Caller ID & spam (the label varies by version) so calls flagged as spam don't ring.

Samsung Galaxy

1. Open the Phone app and tap the three-dot menu.
2. Tap Settings > Block numbers.
3. Turn on Block calls from unknown numbers (some regions say "Block unknown/private numbers").

Same catch as Google's version: this targets callers whose ID is hidden, not every number outside your contacts. The closest match to the iPhone behavior on Android is Do Not Disturb with calls allowed only from contacts.

Does Do Not Disturb block calls?

Yes, unless you allow them. Do Not Disturb and other Focus modes silence calls from anyone not on the allowed list. The phone doesn't ring, and you see a missed call later.

On iPhone: go to Settings > Focus > Do Not Disturb > People and set Allow calls from. Turn on Allow Repeated Calls if you want a second call from the same person within three minutes to ring through.

On Pixel: open Do Not Disturb settings, then People > Calls to choose who can reach you, and turn on Allow repeat callers, which lets a second call within 15 minutes ring.

On Samsung: Do Not Disturb lives under Settings > Modes and Routines (or Notifications > Do not disturb on older versions), with similar exceptions for contacts and repeat callers.

Does Do Not Disturb send calls straight to voicemail?

For callers who aren't allowed, yes. The call is silenced on your end and the caller reaches voicemail. To them it looks the same as Silence Unknown Callers or a phone that's turned off.

Two things people miss:

1. Sleep schedules turn Focus on automatically. If your calls go to voicemail every night or every morning, check Settings > Focus > Sleep.
2. Focus can sync across devices. Turning on Do Not Disturb on a Mac or iPad can turn it on for your iPhone too when "Share Across Devices" is on.

Which option should you use?

For a phone you use for work, the safe baseline is: carrier spam filtering on, hidden-number blocking on, unknown-caller silencing off. For more on blocking without losing customers, read how to stop spam calls on iPhone and Android and our spam call guide for contractors.

Why business owners lose leads with Silence Unknown Callers

Silence Unknown Callers assumes a stranger's call can wait. For a plumber or a salon owner it's the reverse: the calls worth the most come from people you've never spoken to. Someone with water on the kitchen floor won't text you first so your iPhone recognizes them. They call, hear voicemail, and call the next result.

Ask Reason for Calling doesn't close the gap, because you still have to be free to pick up.

To put a number on those silenced calls, use our missed call cost calculator.

The alternative: block spam before it rings, answer every real caller

A business phone needs the opposite filter: stop the calls known to be spam and let every other caller reach someone.

That's how SkipCalls works. You keep your number and set up conditional forwarding, so your phone still rings first. Calls you can't take go to an AI receptionist that answers 24/7, talks to the caller, books the job on your calendar, and texts you a summary when the call ends. About 9 million known spam numbers are stopped by spam blocking before your phone rings, so you can leave unknown-caller silencing off. Setup takes about 5 minutes.

Not sure your own number looks clean to the people you call back? Check it with the free spam number checker. To keep spam out without losing new customers, see the plans.

FAQ

Does Silence Unknown Callers block spam calls?

It silences them along with every other number not in your contacts, Recents, Mail, or Messages. It doesn't check whether a caller is spam. Use carrier spam filtering or Call Filtering for that.

Will I know if a silenced caller called me?

Yes. The call appears in your call list, and any voicemail they leave is saved. With Call Filtering for Unknown Callers on, those calls move to a separate Unknown Callers list in the Phone app.

Where is Silence Unknown Callers in iOS 26?

Settings > Apps > Phone > Screen Unknown Callers. Pick Silence to turn it on or Never to turn it off.

Why can't I find Ask Reason for Calling on my iPhone?

It requires iOS 26. Update under Settings > General > Software Update, then look in Settings > Apps > Phone > Screen Unknown Callers. Some users also report that carrier support and Low Power Mode affect it.

Is there a silence unknown callers option on Android?

Not an exact one. Pixel phones can automatically screen first-time callers with Call Screen. Samsung and the Google Phone app can block private or hidden numbers only. Do Not Disturb set to contacts only is the closest full equivalent.

Do silenced calls go to voicemail?

Yes. With Silence on, unknown callers hear ringing and then reach your voicemail. Calls silenced by Do Not Disturb or a Focus also go to voicemail.

Does Do Not Disturb let emergency calls through?

Only if you allow them. Add important people to the allowed list, or turn on repeated calls (three minutes on iPhone, 15 minutes on Pixel) so a second call breaks through. On iPhone, contacts with Emergency Bypass turned on also ring through.