Blocking a number stops calls and text messages from that contact reaching you

When you block a phone number, your device refuses the incoming call or text message before it reaches you. The blocked caller hears a message saying the call cannot go through, or their text straightforward does not deliver. You do not see a notification that they tried to reach you — the contact is silenced entirely on your end.

Blocking is different from ignoring a call. When you ignore a call, it still rings and you see who called. When you block, the call never rings at all. The blocked person may not know they are blocked — some carriers tell them the number is unavailable, others do not.

The steps to block a number depend on what kind of phone you have and whether you want to block calls, texts, or both. Most phones let you block directly from the phone app or messages app without needing extra software.

Key Takeaways

  • On iPhone, open the Phone app, find the number in your recent calls, swipe left, and tap Block This Caller; on Android, open the Phone app, press and hold the number, and select Block.
  • You can also block a number from a text message by opening the message thread, tapping the contact name at the top, scrolling down, and selecting Block This Caller or Block Contact.
  • Blocked callers will not reach you by phone or text, but they may still be able to reach you through other apps like email, social media, or messaging services you use.
  • If you block someone by mistake, you can unblock them the same way you blocked them — the process reverses in your phone settings.

Blocking a number on iPhone

On an iPhone, the easiest way to block a number is through the Phone app. Open Phone, go to the Recents tab at the bottom, find the number you want to block, and swipe left on it. A red Delete button and a Block This Caller button will appear. Tap Block This Caller. The number is now blocked.

If you want to block a number from a text message instead, open the Messages app, find the conversation with that person, tap their name or number at the top of the thread, scroll down, and tap Block This Caller. You can also block someone from your Contacts app by opening their card, scrolling to the bottom, and tapping Block This Caller.

Once blocked, calls and texts from that number will not ring or notify you. If you change your mind, go back to the same place where you blocked them and tap Unblock This Caller. The block is removed when ready.

Blocking a number on Android

On Android, open the Phone app and find the number in your call history. Press and hold the number until a menu appears, then select Block or Block Number (the exact wording depends on your phone maker). The number is now blocked.

To block from a text message, open the Messages app, find the conversation, press and hold the message or the contact name, and look for an option to Block or Block Contact. Some Android phones also let you block a number by opening your Contacts app, finding the person, tapping the three dots at the top right, and selecting Block.

Android blocks work the same way as iPhone blocks — the person cannot reach you by phone or text. To unblock, go back to the Phone app or Messages app, find the blocked number, press and hold it, and select Unblock.

What happens when you block someone

When you block a number, the blocked caller's experience depends on their carrier and your phone type. On most networks, they hear a message saying the call cannot go through or the number is unavailable. Some carriers tell them the number is not accepting calls. A few do not tell them anything — the call just fails silently.

Text messages from blocked numbers usually fail to send, though the sender may not get an error message. They might think the text went through when it did not. There is no way for you to know they tried to contact you unless they reach you through another method.

Blocking only works for phone calls and text messages through your carrier. If someone has your email address, social media account, or messaging app like WhatsApp or Facebook Messenger, they can still reach you that way. Blocking a phone number does not block them from those services.

When blocking is not enough

If someone is harassing you through multiple methods — phone, text, email, and social media — blocking the phone number alone will not stop them. You may need to block them on each platform separately. Most messaging apps and social media sites have their own block features in settings or on the person's profile.

If the harassment is severe or threatening, contact your local police department or your phone carrier's abuse team. Most carriers have a process for reporting spam and harassment, and they can sometimes take action beyond what you can do on your phone. Keep records of the calls, texts, or messages if you plan to report them.

Blocking spam and robocalls

Many phones now come with built-in spam detection that automatically blocks or flags likely spam calls. On iPhone, go to Settings, then Phone, and turn on Silence Unknown Callers — this sends calls from numbers not in your contacts to voicemail. On Android, open the Phone app, tap the three dots at the top, go to Settings, then Spam and Abuse, and turn on Spam Protection.

These features block calls from unknown numbers automatically, but they also mean legitimate callers you do not know — like your doctor's office or a delivery driver — will go to voicemail. You can still see that they called and call them back. If you want more control, you can block individual spam numbers as they come in using the steps above.

Unblocking a number you blocked by mistake

If you blocked someone by accident, the process to unblock is straightforward and works the same way on both iPhone and Android. On iPhone, go to Settings, then Phone, scroll down to Blocked Contacts, find the number, and swipe left, then tap Unblock. On Android, open the Phone app, tap the three dots, go to Settings, find Blocked Numbers or Blocked Contacts, find the number, and tap Unblock.

Once unblocked, the person can call and text you again, and you will see their calls and messages normally. There is no notification sent to them that you unblocked them — they straightforward regain the ability to reach you.

Frequently Asked Questions

Can someone tell if I blocked them?

Not for certain. They may suspect it if their calls always go to voicemail or their texts never get responses, but your phone does not send them a notification saying they are blocked. Some people test by calling from a different number to see if that call goes through.

Will blocking someone delete our text conversation?

No. Blocking only stops future calls and texts from reaching you. Your old messages with that person stay in your Messages app unless you delete the conversation manually. You can read the old messages anytime, but new ones from them will not arrive.

What if someone keeps calling from different numbers?

Block each number as it comes in. If the harassment is ongoing and from many numbers, contact your phone carrier's abuse team or your local police. Some carriers can identify patterns of harassment and take action. You can also report the behavior to the Federal Communications Commission if it involves robocalls.

Does blocking work on WhatsApp or Facebook Messenger?

Those apps have their own separate block features. Blocking someone's phone number does not block them on WhatsApp or Messenger. You have to block them within each app separately by opening their profile and selecting Block or Block Contact.

Can I block a number without adding it to my contacts?

Yes. You can block a number directly from your call history or message thread without ever saving it to your contacts. The number stays blocked whether or not it is in your contacts list.