Block a single number in the Messages app

The fastest way to block a text sender is through the Messages app itself. Open Messages, find the conversation from the number you want to block, and tap the sender's name or number at the top of the thread. A menu will appear with contact details. Scroll down and tap Block this Caller, then confirm by tapping Block Contact.

Once blocked, that number cannot send you text messages, and any existing messages from them stay in your Messages app but won't notify you. If you change your mind, you can unblock the same way: open the conversation, tap the name at the top, scroll down, and tap Unblock this Caller.

Block a number from the Phone app or Contacts

You can also block a number without opening a text thread. In the Phone app, go to Recents, find the number, swipe left on it, and tap the trash icon, then Block this Caller. In Contacts, open the contact card, tap the info button (circle with an i), scroll to the bottom, and select Block this Caller.

This method works even if you have never texted the number before — useful if you want to block a caller who has only phoned you, or if you know a number you want to preemptively block.

Key Takeaways

  • Open any text from the sender, tap their name at the top, scroll down, and tap Block this Caller to stop receiving messages from that number.
  • Blocked numbers can still leave voicemails and see that their calls and texts were not delivered, so blocking is not invisible to the sender.
  • You can block a number from the Phone app's Recents list or from a contact card without needing an existing message thread.
  • Blocked messages remain in your Messages app but produce no notifications; you can view them anytime by opening the conversation.
  • Unblocking uses the same menu: open any message or contact from that number, tap the name, and select Unblock this Caller.

What happens when you block a number

A blocked number cannot send you SMS or iMessage texts, and they will not receive a delivery confirmation. However, they can still call you — the call will ring through normally unless you have also blocked them in the Phone app. They can also leave voicemails, which will appear in your voicemail inbox.

The blocked sender may notice their messages are not being delivered, since there is no "delivered" or "read" indicator. This is different from blocking on social media, where the block is often invisible to the other person. On iPhone, blocking is somewhat visible in the sense that texts simply do not go through.

Managing your blocked list

To see all the numbers you have blocked, open Settings, tap Phone (or Messages), and scroll down to Blocked Contacts. This list shows every number you have blocked across the Phone and Messages apps. You can tap Edit in the top-left corner and then tap the red minus icon next to any number to unblock it.

If you block a contact by name (someone in your Contacts app), blocking applies to all their phone numbers and email addresses associated with that contact card. If you block a raw number that is not saved as a contact, only that specific number is blocked.

Blocking spam and unknown numbers

If you receive texts from numbers you do not recognize, you can block them the same way as any other sender. You do not need to know who the number belongs to. Many people block entire ranges of numbers that are known spam sources, though you can only block one number at a time through the iPhone interface.

For repeated spam from many different numbers, consider enabling Filter Unknown Senders. Open Settings, tap Messages, and turn on Filter Unknown Senders. This moves texts from numbers not in your Contacts to a separate tab, keeping your main inbox clear. It does not block the messages — they are still there if you want to read them — but they will not notify you.

Blocking does not stop iMessage from the same Apple ID

If someone has your phone number saved in their Apple ID account, they may be able to reach you through iMessage even after you block their number. This happens because iMessage routes through Apple's servers using the Apple ID, not just the phone number. If this occurs, you will need to block them through your Apple ID settings as well.

To do this, open Settings, tap your name at the top, go to iCloud, and look for any shared services or linked accounts. If you suspect someone is contacting you through a linked Apple ID, you may need to review your account security or contact Apple Support for help removing unauthorized access.

Frequently Asked Questions

Can a blocked number tell they have been blocked?

Not directly, but they will notice their texts do not show a "delivered" status. On iPhone, blocked messages simply fail to send, so a persistent sender will eventually realize something is wrong. They cannot see a message saying "you are blocked," but the lack of delivery confirmation is a clue.

Will blocked numbers still reach me through other apps?

Yes. Blocking a number in Messages and Phone only affects SMS, iMessage, and calls through those apps. The person can still contact you through email, social media, WhatsApp, or any other service. If you need to block someone across multiple platforms, you will need to block them in each app separately.

What if I block someone by accident?

Open Settings, tap Phone or Messages, scroll to Blocked Contacts, tap Edit, and tap the red minus icon next to the number. They will immediately be able to text and call you again. There is no notification sent to them when you unblock.

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

Yes. You can block any phone number, whether it is in your Contacts or not. Open the message or call from that number and use the block option. The number does not need to have a name attached to be blocked.

Do blocked messages take up storage space?

Yes. Blocked messages remain in your Messages app and count toward your phone's storage. If you want to delete them, open the conversation, tap Edit, select the messages, and tap Delete. Blocking only stops new messages from arriving — it does not erase old ones.