The basic steps differ by phone type, but all phones let you block directly from the call log

You can block a number on any smartphone in under a minute. The exact steps depend on whether you use iPhone or Android, but both let you block from your recent calls list, from a contact card, or from settings. You do not need an app or a service plan change — blocking is built into the phone itself.

When you block a number, calls and text messages from that number go straight to voicemail (or are silently rejected, depending on your phone). The person calling will not hear a busy signal or a message saying they are blocked — the call straightforward fails to reach you. They may eventually realize you are not answering, but they will not get a notification that you blocked them.

Key Takeaways

  • On iPhone, open the recent call, tap the info icon, scroll down, and tap "Block this Caller"; on Android, long-press the number in your call log and select "Block number."
  • Blocking happens on your device itself, not through your carrier, so the blocked person will not know they are blocked.
  • You can unblock a number at any time through your phone's settings or by finding the contact and selecting "Unblock."
  • If a blocked number keeps contacting you from different numbers, your carrier may offer additional tools like call filtering or a separate spam-blocking service.

Blocking on iPhone

Open the Phone app and go to the Recents tab. Find the number you want to block, tap the circle with an "i" next to it, scroll to the bottom of that contact's information, and tap "Block this Caller." The number is now blocked on your device.

If you want to block someone who is already in your contacts, open their contact card, tap "Block this Caller" at the bottom, and confirm. You can also block directly from a text message: open Messages, find the conversation, tap "Details" in the top right, and select "Block this Caller."

To see your list of blocked numbers, open Settings, go to Phone, and tap "Blocked Contacts." From there you can tap "Edit" and remove anyone from the blocked list if you change your mind.

Blocking on Android

Open the Phone app and go to the Recents or Call History tab. Long-press (hold your finger on) the number you want to block until a menu appears, then tap "Block number" or "Block contact." Some Android phones say "Add to reject list" instead. The number is now blocked.

If the person is in your contacts, you can also open their contact card, tap the three-dot menu at the top, and select "Block number." To block from a text message, open Messages, long-press the conversation, and look for a block or report option.

To see your blocked list, open the Phone app, tap the three-dot menu, go to Settings, and look for "Blocked numbers" or "Blocked contacts." The exact location varies by phone manufacturer and Android version, but it is always in the Phone app settings.

What happens when you block someone

A blocked number cannot call you, text you, or reach you through FaceTime or iMessage (on iPhone). Their calls go to voicemail, but they will not hear a message saying they are blocked — the call will straightforward fail. They may see a message like "call failed" or "unable to connect," but they will not receive a notification that you blocked them.

Text messages from a blocked number are silently rejected. The person sending the text will not know whether their message reached you or failed — it will appear to them as if it was sent normally. This is different from being ignored, which they might eventually figure out; blocking is invisible to the other person.

If someone you blocked tries to call you repeatedly from the same number, your phone will continue to block them. If they call from a different number, that new number will not be blocked unless you block it separately.

Unblocking a number

You can unblock someone at any time. On iPhone, go to Settings > Phone > Blocked Contacts, find the person you want to unblock, tap "Edit," and tap the red minus sign next to their name. On Android, open the Phone app settings, find your blocked list, long-press the contact, and select "Unblock."

Once you unblock a number, calls and texts from that person will come through normally again. There is no notification sent to them when you unblock — they straightforward start reaching you again if they try to contact you.

When blocking alone is not enough

If someone keeps calling from different numbers, blocking each one individually becomes tedious. Your phone carrier may offer additional tools. AT&T, Verizon, T-Mobile, and most regional carriers have spam-filtering services (sometimes free, sometimes a small monthly fee) that can block categories of calls — robocalls, likely spam, or numbers flagged by other users.

On iPhone, you can also enable "Filter Unknown Senders" in Settings > Messages, which silences texts from people not in your contacts. On Android, the Phone app often has a built-in spam filter you can turn on in settings. These tools do not block specific numbers; instead, they filter calls and texts based on patterns or reports from other users.

If you are receiving threatening messages or calls, blocking and filtering are not enough. Contact your local police department and your carrier's abuse team. Most carriers have a process for reporting harassment and can take additional steps if a pattern of contact is documented.

Frequently Asked Questions

Can someone tell if I blocked them?

No. When a blocked number calls you, the call fails silently. They will not hear a message saying they are blocked, and they will not receive a notification. They may eventually realize you are not answering, but they cannot know for certain that you blocked them rather than straightforward not picking up.

What if I block someone by accident?

You can unblock them when ready. On iPhone, go to Settings > Phone > Blocked Contacts and tap "Edit," then the red minus sign. On Android, open Phone settings, find your blocked list, and select "Unblock." Once unblocked, their calls and texts will come through normally again.

Does blocking work across all apps?

Phone and text blocking works for calls and SMS messages. If someone contacts you through email, social media, or messaging apps like WhatsApp or Facebook Messenger, blocking your phone number will not stop them. You will need to block them separately in each app.

Will a blocked person still be able to leave a voicemail?

Yes. When you block a number, their call goes to voicemail, and they can leave a message. You will not be notified of the voicemail, but it will be stored in your voicemail system. You can listen to it later if you choose.

What is the difference between blocking and do not disturb?

Do Not Disturb silences all calls and notifications for you, but the caller still reaches your voicemail normally and does not know you have Do Not Disturb on. Blocking prevents a specific number from reaching you at all. Use blocking for unwanted callers and Do Not Disturb when you want peace but are still reachable to people you know.