How To Send Spam Calls To Voicemail On iPhone (iOS 26, 2026)

Spam calls keep ringing your iPhone, and you want the unknown ones to go straight to voicemail instead.

Your iPhone can do exactly that with a built-in setting, and a newer option can also make callers explain themselves first.

Setup takes about a minute, and the one thing to do beforehand is make sure the people you want to hear from are saved in Contacts.

Quick answer: send unknown callers to voicemail

Open Settings and tap Apps, then Phone.
Find Screen Unknown Callers.
Choose Silence.

On iOS 18 and earlier the setting is a toggle called Silence Unknown Callers inside Settings > Phone.

Calls from numbers saved in your Contacts always get through, whichever option you pick.

What do the three Screen Unknown Callers options do?

Option	What happens to a call from an unsaved number	Best for
Never	Rings like any other call	Turning the feature off
Ask Reason for Calling	The caller is asked why they are calling before your phone rings	Filtering robocalls while still hearing real callers
Silence	Silenced and sent to voicemail automatically	Maximum quiet

Apple lists these three options on its unknown callers support page.

How do I set it up on iOS 26?

Call screening works only in the redesigned Phone app that arrived with iOS 26, which covers iPhone 11 and newer, according to Engadget.

Update first at Settings > General > Software Update if you are on an older version.
Go to Settings > Apps > Phone.
Under Screen Unknown Callers, pick Silence for voicemail, or Ask Reason for Calling to screen.

Silence matches the old Silence Unknown Callers toggle from iOS 18, as MacRumors describes it.

When should I pick Ask Reason for Calling instead?

With this option the iPhone answers the call, asks for the caller’s name and purpose, and transcribes the reply on screen.

The caller hears an automated prompt and is told to hold, and you get a silent alert with a transcript.

You then have a few seconds to accept or reject the call, and if you do not, the caller can leave a message.

The trade-off is that real callers from unknown numbers, such as a doctor’s office, have to answer the prompt before you will pick up.

Silence is the stricter choice, because unknown calls never ring at all.

How do I set it up on iOS 18 or earlier?

Open Settings and tap Phone.
Scroll to Silence Unknown Callers, which sits below Show My Caller ID.
Turn the toggle on.

Unknown numbers are then silenced, but calls from numbers in Contacts, Messages, Mail or recent calls still ring, according to Mac Observer.

Which calls still ring and which are missed?

Situation	What your iPhone does
Number saved in Contacts	Rings normally
Unsaved number with Silence on	Goes to voicemail
You call emergency services	Call screening turns off for 24 hours
You are roaming	Calls are not screened, whatever the setting

The emergency-call and roaming rules come from Apple’s support page.

What is Call Filtering on iOS 26?

Call Filtering is a separate iOS 26 switch under Settings > Apps > Phone > Call Filtering.

It moves missed calls and voicemails from unknown callers, and from numbers your carrier flags as spam or fraud, into their own lists instead of your main call list.

SlashGear reports that it is off by default, so you have to turn on Unknown Callers and Spam yourself.

Calls from those numbers will not ring, so a delivery driver or contractor you have not saved could be silenced.

How do I let a real caller through?

Open the Phone app, tap Recents, then the filter icon at the top right.
Open Unknown Callers and find the number.
Tap Mark as Known, then confirm.

The number then appears under Other Known in Contacts and rings normally, and you can reverse it with Mark as Unknown there.

Which settings combination suits you?

MBS Direct suggests three levels, depending on how much you can risk missing a real call.

Level	Screen Unknown Callers	Call Filtering switches
Most cautious	Never	Both off
Middle ground	Ask Reason for Calling	Spam filter only
Most aggressive	Ask Reason for Calling or Silence	Both on

Should I filter spam texts too?

Messages has its own filters under Settings > Apps > Messages.

Screen Unknown Senders: moves messages from unknown senders into a separate list.
Filter Spam: moves junk into a Spam list.

Tap the Filter button in Messages to check those lists, because each message appears in only one list.

Where do the silenced calls and voicemails go?

Apple says missed calls and voicemails from unknown numbers move to an Unknown Callers list, and spam calls land in a Spam list.

In the Phone app, tap the Filter button to view them, which appears in Recents in Classic view or in Calls in Unified view.

Check that list now and then so a real voicemail does not sit unheard.

How do I block one specific number?

Open the Phone app and go to the Recents tab.
Tap the (i) icon next to the number.
Scroll down and tap Block this Caller.

To undo it, open Blocked Contacts in the Phone settings, swipe left on the number, and tap Unblock.

Add a spam filter from your carrier or an app

Silence handles unknown numbers, while these tools try to label or stop known spam.

AT&T: the ActiveArmor or Call Protect app, which has a free basic version.
Verizon: the Call Filter app, which also has a free basic version.
T-Mobile: the Scam Shield app, with Scam Block.
Third-party apps: install one, then switch it on under Settings > Phone > Call Blocking & Identification.

Options vary by carrier, region and installed apps.

Other steps that reduce spam

Registering at DoNotCall.gov or by calling 888-382-1222 is free, but it takes time and will not stop every unwanted call.

You can also ask your carrier to block numbers you report.

What if the setting does not seem to work?

Problem	Likely reason
Spam still rings	The number is saved in Contacts, or it appears in your recent calls or messages
A real call never reached you	Silence sent it to voicemail, so check the Unknown Callers list
Calls are not screened while traveling	Roaming turns call screening off
No Screen Unknown Callers option	Your iPhone may be on iOS 18 or earlier, where it is a toggle in Settings > Phone

Official page used: Apple: manage unknown callers on iPhone.