Block a number on iPhone or Android

Both iPhone and Android let you block text messages from a specific number directly in your Messages app. The steps differ slightly between the two, but both take less than a minute.

On iPhone, open the conversation with the number you want to block. Tap the contact name or number at the top of the thread, then scroll down and tap Block this Caller. Confirm the action. Once blocked, texts from that number will no longer appear in your inbox — they go to a separate folder you can view in Settings if needed.

On Android, the process depends on your phone's manufacturer and which messaging app you use. In Google Messages (the default on most newer Android phones), open the conversation, tap the three dots at the top right, and select Block. In Samsung Messages, tap and hold the conversation, then tap the block icon. Other messaging apps like WhatsApp or Facebook Messenger have their own block features within each conversation.

Key Takeaways

  • iPhone users can block a number by opening the conversation, tapping the contact name, and selecting Block this Caller.
  • Android users can block through Google Messages, Samsung Messages, or their phone's default app — the exact steps vary by manufacturer.
  • Blocked numbers cannot see that they are blocked; their messages straightforward do not reach your inbox.
  • You can unblock a number at any time through your phone's settings or the messaging app itself.
  • Blocking a number for texts does not automatically block calls from that number — you may need to block calls separately.

What happens when you block a number

When you block a number, text messages from that sender stop appearing in your main message thread. The blocked messages do not delete past conversations — they straightforward do not arrive as new notifications. On iPhone, blocked messages go to a hidden folder you can access through Settings > Messages > Blocked Contacts if you ever need to review them.

The person sending the texts has no way to know they are blocked. Their message may appear to send normally on their end, but it will not reach your phone. This is different from straightforward deleting a conversation, which only removes the thread from your view but does not stop future messages.

Block numbers in third-party messaging apps

If you use WhatsApp, Facebook Messenger, Telegram, or another messaging platform, blocking works within that app only — it does not block SMS text messages from the same number. Each app has its own block list.

In WhatsApp, open the chat with the person you want to block, tap the three dots, and select Block Contact. In Facebook Messenger, tap the person's name at the top of the conversation, scroll down, and tap Block. Telegram and other apps follow similar patterns — look for a block or report option in the conversation settings.

If someone contacts you through multiple apps, you will need to block them separately in each one. Blocking them on WhatsApp does not block them on Messenger, for example.

Unblock a number if you change your mind

You can unblock a number at any time. On iPhone, go to Settings > Phone > Blocked Contacts (or Settings > Messages > Blocked Contacts for text messages specifically) and swipe left on the number you want to unblock, then tap Unblock. On Android, open your messaging app, go to Settings or the menu, find Blocked Numbers or Blocked Contacts, and tap the unblock option next to the number.

Once unblocked, messages from that number will reach your inbox again. You will not receive notifications for messages that arrived while the number was blocked — those remain hidden unless you manually check the blocked folder.

When blocking is not enough

If you receive repeated unwanted texts from different numbers, blocking one at a time becomes impractical. Many carriers offer spam-filtering services that catch common spam and scam texts before they reach you. Contact your carrier — Verizon, AT&T, T-Mobile, or others — to ask about their spam-blocking options, which may be free or cost a few dollars per month.

If the texts are harassing or threatening, document them and consider reporting the number to your carrier or local law enforcement. Some messaging apps also have a Report option alongside the block option, which sends information about the sender to the app's safety team.

Blocking calls from the same number

Blocking a number for texts does not automatically block calls from that same number on most phones. You will need to block calls separately. On iPhone, open the Phone app, find the number in your recent calls, tap the info icon, and select Block this Caller. On Android, open the Phone app, find the number, tap the three dots, and select Block number.

Some phones let you block a contact entirely (both calls and texts) through your Contacts app. Open the contact, tap the menu, and look for a block option. This approach blocks the number across all communication types at once.

Frequently Asked Questions

Can a blocked number tell they are blocked?

No. A blocked number cannot tell whether you blocked them, deleted the conversation, or straightforward do not respond. Their message may appear to send normally on their end, but it will not reach your phone.

Will blocking a number delete past messages?

No. Blocking stops future messages from arriving, but it does not delete the conversation history. On iPhone, you can still view past messages in the blocked contacts folder. On Android, the conversation remains in your app unless you manually delete it.

What if I block a number by mistake?

You can unblock it when ready through your phone's settings or messaging app. Go to your blocked contacts list, find the number, and tap unblock. Future messages from that number will reach your inbox normally.

Does blocking a text number also block calls?

Not automatically. Blocking for texts and blocking for calls are usually separate on both iPhone and Android. You may need to block the number twice — once in Messages and once in Phone — to stop both texts and calls.

Can I block an unknown number?

Yes. If you receive a text from a number not in your contacts, you can block it directly from the message thread. Open the conversation, tap the number or contact name, and select block. You do not need the number saved as a contact first.