The fastest way to block a spam call on iPhone

When a spam call comes in, you can block it when ready by tapping the call, swiping up, and selecting "Block this Caller." The call goes to voicemail and that number cannot reach you again. If you miss the call, open the Phone app, find the number in your Recent calls, swipe left on it, and tap the trash icon, then tap "Block this Caller" from the menu that appears.

You can also block a contact before they ever call. Open the Phone app or Contacts app, find the number, tap the info icon (a circle with an "i"), scroll down, and select "Block this Caller." Once blocked, calls and texts from that number go straight to voicemail, and you will not see notifications.

Blocked callers can still leave voicemails, but you will not be notified. Their messages sit in a separate voicemail folder you can check or ignore. If you change your mind, you can unblock the number the same way — tap the info icon and select "Unblock this Caller."

Key Takeaways

  • You can block a spam call as it comes in by tapping it and selecting "Block this Caller," or block it later from your Recent calls list.
  • Blocked numbers go to voicemail without ringing your phone or sending you a notification.
  • The "Filter Unknown Senders" setting in the Phone app silences calls from numbers not in your contacts, though they still reach voicemail.
  • Silence Unknown Callers, available on iPhone XS and newer, sends calls from unknown numbers straight to voicemail without any ring.
  • You can unblock a number at any time by finding it in your contacts or recent calls and selecting "Unblock this Caller."

Using Filter Unknown Senders to reduce spam calls

The "Filter Unknown Senders" setting reduces spam without blocking specific numbers. Open Settings, go to Phone, and turn on "Filter Unknown Senders." Calls from numbers not in your contacts, not in your recent calls, and not in your voicemail will be silenced — they will not ring or notify you, but they will still reach your voicemail.

This setting is useful if you receive many spam calls but still need to hear from unknown numbers for work or medical appointments. The trade-off is that you have to check voicemail to catch legitimate callers you do not know. Calls from businesses you have contacted before may still come through if your phone recognizes them.

Filter Unknown Senders does not block specific numbers — it only silences unknown ones. If a spam caller is in your contacts or has called you before, they will still ring through. For persistent spam from a known number, you still need to block that caller individually.

Silence Unknown Callers for the strictest filtering

If you have an iPhone XS, iPhone XS Max, iPhone XR, or any newer model, you can use "Silence Unknown Callers." This setting is more aggressive than Filter Unknown Senders: calls from numbers not in your contacts go straight to voicemail without ringing at all. Open Settings, go to Phone, and turn on "Silence Unknown Callers."

The downside is that you will miss calls from numbers you do not know, even if they are legitimate. Doctors' offices, delivery services, and customer service lines will not reach you. You have to check voicemail regularly to catch important calls. Most people use this setting only during work hours or when they do not want to be disturbed.

You can turn Silence Unknown Callers on and off as needed. If you are expecting a call from an unknown number, turn it off temporarily, take the call, and turn it back on. The setting does not block specific numbers — it silences all unknown callers equally.

Reporting spam calls to Apple and your carrier

When you block a spam caller, you can also report them to Apple. After blocking, a "Report Junk" option may appear in the Phone app. Tap it to send information about the call to Apple. This helps Apple improve its spam detection, though it does not punish the caller or remove them from circulation.

Your carrier — Verizon, AT&T, T-Mobile, or another provider — also has spam-reporting tools. Some carriers offer free apps like Call Filter (AT&T), Scam Shield (T-Mobile), or Call Filter Pro (Verizon) that identify and block spam before it reaches your phone. These apps use carrier data to flag known spam numbers and can block them automatically.

Reporting spam is optional and does not change what happens to the call you received. The blocked call is already gone from your phone. Reporting helps the broader system, but your when ready protection comes from blocking the number itself.

Understanding what happens when you block a caller

When you block someone on iPhone, several things happen at once. Their calls go to voicemail without your phone ringing or showing a notification. Their text messages are not delivered to you — they may see a "delivered" status, but you will not receive them. FaceTime calls from blocked numbers are also silenced.

The blocked caller does not receive a message saying they are blocked. They will hear a normal ring tone and may assume you did not answer. They can leave a voicemail, which appears in a separate "Blocked Messages" folder in the Phone app that you can access if needed.

Blocking is not permanent. You can unblock a number at any time by opening your contacts or recent calls, finding the number, tapping the info icon, and selecting "Unblock this Caller." Once unblocked, calls and texts from that number come through normally again.

Managing your blocked list and cleaning up old blocks

To see all the numbers you have blocked, open Settings, go to Phone, and scroll down to "Blocked Contacts." This list shows every number you have blocked on this iPhone. If you want to unblock someone, tap "Edit" in the top right, select the contact, and tap "Unblock."

You can also access your blocked list through the Phone app. Open the app, tap Recents, find a blocked number, swipe left on it, and tap the info icon to see the unblock option. Some people keep a blocked list for months or years; others clean it up regularly. There is no limit to how many numbers you can block.

If you switch to a new iPhone, your blocked list does not automatically transfer. You will need to re-block numbers on the new device, or restore from a backup that includes your blocked contacts. Blocking is stored on the device itself, not in iCloud.

Why spam calls keep coming even after you block them

Blocking one number does not stop spam calls from other numbers. Spam callers use software to generate thousands of phone numbers, often spoofing local area codes to make calls look legitimate. When you block one number, another one calls the next day from a different number.

This is why blocking alone is not enough. Combining blocking with Filter Unknown Senders or Silence Unknown Callers reduces the noise significantly. You will still receive voicemails from unknown numbers, but your phone will not ring constantly.

Some spam calls come from legitimate businesses using automated systems. If you have interacted with a company — a bank, insurance provider, or retailer — they may call you with offers or alerts. Blocking stops those calls, but you may want to contact the company directly and ask to be removed from their calling list instead.

Frequently Asked Questions

Can I block a number if I do not know who it is?

Yes. Open the Phone app, find the number in your Recent calls, swipe left, and tap "Block this Caller." You do not need to know who the number belongs to. If you want to research the number first, you can search it online or use a reverse phone lookup service before deciding to block.

What is the difference between blocking and filtering?

Blocking stops a specific number from reaching you. Filtering silences all calls from unknown numbers at once. You can use both together — block specific spam numbers and also turn on Filter Unknown Senders to quiet the rest.

Do blocked callers know they are blocked?

No. They hear a normal ring tone and may think you did not answer. They can leave a voicemail, which you will not be notified about. There is no message that tells them they are blocked.

Can I block a number that is not in my contacts?

Yes. You can block any number from your Recent calls list, even if it is not saved as a contact. Find the number in the Phone app, swipe left, and select "Block this Caller."

Will blocking stop text messages from that number?

Yes. Blocked numbers cannot send you text messages or iMessages. Messages from blocked numbers do not appear in your conversation list, though you can see them in the Blocked Messages folder if you need to.