The fastest way to block a number on iPhone

Open the Phone app, find the number you want to block in your recent calls list, tap the info icon (the circle with an "i"), scroll down, and tap Block this Caller. That number can no longer call or text you, and their calls go straight to voicemail without your phone ringing. If you do not have a recent call from that number, you can open Settings, go to Phone, tap Blocked Contacts, and add the number manually by tapping Add New.

Blocked callers do not see a message saying they are blocked — their call straightforward fails to reach you, and they may hear a busy signal or be sent to voicemail. You can unblock a number the same way: go to Settings > Phone > Blocked Contacts, swipe left on the number, and tap Unblock.

Key Takeaways

  • You can block a number directly from a recent call by tapping the info icon and selecting Block this Caller.
  • Blocked callers cannot reach you by phone or text, and they will not know they are blocked.
  • You can block up to a few hundred numbers on a single iPhone before running into limits, depending on your iOS version.
  • Blocking a number does not delete past messages or calls from that person — those remain in your history unless you delete them separately.
  • If someone is harassing you through multiple numbers, consider using Do Not Disturb or Focus modes to silence unknown callers instead of blocking each number individually.

Blocking from Messages or FaceTime

You can also block a number from the Messages app or FaceTime without opening the Phone app. In Messages, find the conversation, tap Edit in the top left, tap the red minus icon next to the conversation, then tap Delete. Open the conversation again, tap the contact name at the top, scroll down, and tap Block this Caller.

In FaceTime, find the call or contact you want to block, tap the info icon, and select Block this Caller. The process is the same across all three apps — the block applies to phone calls, text messages, and FaceTime simultaneously, so you only need to block once.

What happens to old messages and calls

Blocking someone does not erase your conversation history with them. All past text messages, iMessages, and call logs remain in your Phone, Messages, and FaceTime apps. You can still see those conversations if you scroll back through your history, but new messages and calls from that blocked number will not come through.

If you want to remove the conversation entirely, you can delete it manually. Swipe left on the conversation in Messages or the recent call in the Phone app and tap Delete. This is separate from blocking — you can delete a conversation without blocking the person, or block someone and keep their old messages.

Using Focus modes and Do Not Disturb for multiple unwanted callers

If you are receiving calls from many different numbers (like spam or robocalls), blocking each one individually can become tedious. Instead, you can use Focus modes or Do Not Disturb to silence calls from unknown numbers while still allowing calls from your contacts through.

To set this up, go to Settings > Focus > Do Not Disturb, tap Customize, and under Calls select Favorites Only or Contacts Only. You can also go to Settings > Phone > Silence Unknown Callers to automatically send calls from numbers not in your contacts to voicemail. This does not block the numbers — they can still leave voicemails — but you will not be interrupted by their calls.

Blocking numbers from your carrier

Your phone carrier (AT&T, Verizon, T-Mobile, or another provider) may offer its own call-blocking service separate from your iPhone's built-in blocking. These carrier services can sometimes block calls before they reach your phone at all, which is useful for robocalls and spam that spoof numbers.

AT&T offers Call Protect, Verizon offers Call Filter, and T-Mobile offers Scam Shield. You can usually turn these on through your carrier's app or by calling customer service. These services work alongside your iPhone's built-in blocking — you can use both at the same time. Carrier-level blocking does not require you to know the exact number in advance, so it can catch spam calls that use randomly generated numbers.

Limits and what to know about blocked numbers

Your iPhone can block hundreds of numbers, though the exact limit depends on your iOS version and available storage. In practice, most people never hit this limit. If you are blocking so many numbers that you are concerned about running out of space, that is usually a sign that a carrier-level spam filter or Do Not Disturb setting would be more practical than individual blocks.

Blocked numbers cannot see that they are blocked — they will not receive a notification or message. Their calls go to your voicemail, and if they text you, the message may be delivered to your phone but you will not be notified. Some people assume they have been blocked if their calls go unanswered, but there is no technical way for them to confirm it.

Frequently Asked Questions

Can someone tell if I blocked them?

No. A blocked caller will not receive a notification, and there is no technical signal that tells them they have been blocked. Their call will fail or go to voicemail, but that can happen for many reasons. They may suspect they are blocked if calls consistently fail, but they cannot confirm it through the iPhone itself.

What if I block someone by accident?

Go to Settings > Phone > Blocked Contacts, find the number, swipe left, and tap Unblock. The person can then call or text you normally again. Your old conversation history with them will still be there.

Do blocked calls show up in my call history?

No. Blocked calls do not appear in your recent calls list. If you want to see a record of who tried to call you, you would need to check your carrier's online account or call customer service — they keep logs of incoming calls even if your phone does not show them.

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

Yes. You can add any number to your blocked list manually through Settings > Phone > Blocked Contacts > Add New, even if you have never received a call from that number. You do not need to have a recent call or conversation with someone to block them.

Will blocking stop spam and robocalls?

Blocking individual numbers stops calls from those specific numbers, but spam and robocalls often come from different numbers each time. For spam, use Silence Unknown Callers, your carrier's spam filter, or a third-party app like Nomorobo. Blocking is most useful for people you know, not for random spam.