Blocking stops someone from contacting you, but they won't know it happened

When you block a contact on WhatsApp, that person can no longer send you messages, call you, or see when you are online. They cannot see your profile picture, status updates, or "last seen" timestamp. However, WhatsApp does not send them a notification that you blocked them — they will only realize it if they try to message you and notice their messages are not delivering, or if they cannot find your profile information.

Blocking is permanent until you unblock the person. You can unblock them at any time through the same menu where you blocked them. If you block someone and then unblock them later, the conversation history remains in your chat list, but they will not see any messages you sent while they were blocked.

WhatsApp stores your block list locally on your phone. If you switch to a new phone or reinstall WhatsApp, your block list transfers with your account backup, so you do not have to re-block people.

Key Takeaways

  • A blocked person cannot message you, call you, or see your online status, but WhatsApp does not notify them that you blocked them.
  • You can block someone directly from a chat, from their contact card, or from your contacts list — all three methods take less than ten seconds.
  • Blocking does not delete your conversation history with that person, though they cannot see messages you sent after the block took effect.
  • You can unblock someone at any time through Settings, and your block list moves with you if you switch phones or reinstall the app.

How to block someone from an open chat

The fastest way to block someone is from inside an active conversation. Open the chat with the person you want to block, then tap their name or phone number at the top of the screen. This opens their contact card.

Scroll down to the bottom of the card. You will see a red "Block" button. Tap it, and WhatsApp will ask you to confirm. Tap "Block" again in the confirmation box. The person is now blocked, and the chat remains in your list but they cannot send new messages to you.

On iPhone, the button may say "Block Contact" instead of "Block", but it does the same thing. The confirmation step is the same on both platforms.

How to block someone from your contacts list

If you do not have an active chat with the person, you can block them from your phone's contacts. Open WhatsApp and go to the Contacts tab (on Android) or tap the Chats icon and scroll to the top where you see "Contacts" (on iPhone).

Find the person's name in the list and tap it to open their contact card. Scroll down and tap the red "Block" button. Confirm the block when prompted. This method works the same way as blocking from a chat, but you do not need an existing conversation with them.

How to block someone from a group chat

You can block a group member without leaving the group. Open the group chat, then tap the group name at the top to see the member list. Find the person you want to block and tap their name to open their contact card.

Scroll down and tap "Block". Confirm when prompted. You will stay in the group and can still see messages from other members, but this person's messages will not reach you, and they cannot see your messages or call you. You will still appear in the group member list to everyone else.

How to see who you have blocked

To view your block list, open WhatsApp and tap the three-dot menu icon (Android) or Settings (iPhone). On Android, select "Settings" then "Account" then "Privacy" then "Blocked contacts". On iPhone, go to Settings, scroll down to "Privacy", and tap "Blocked Contacts".

Your block list shows every person you have blocked. From this screen, you can tap any name and choose to unblock them. Unblocking restores normal contact — they can message you and call you again, and they can see your online status.

What happens when you block someone

A blocked person's messages do not reach your phone at all. If they try to send you a message, it will show a single checkmark on their end (meaning it left their phone) but will never deliver. They will not receive a "message failed" notification — the message will straightforward sit in their chat with you, appearing to be sent but never actually arriving.

If they try to call you, the call will not ring on your phone. On their end, the call may ring for a few seconds before failing, or it may fail when ready depending on your phone's network. Either way, you will not see the call attempt.

Blocked people cannot see your profile picture, status updates, or last seen time. If they visit your contact card in their phone, these fields will appear blank or show a generic placeholder. They also cannot add you to groups or see groups you are in.

How to unblock someone

Open WhatsApp and go to Settings (iPhone) or the three-dot menu then Settings (Android). Navigate to Account > Privacy > Blocked Contacts (Android) or Settings > Privacy > Blocked Contacts (iPhone).

Find the person you want to unblock and tap their name. Select "Unblock" and confirm. They can now message you and call you again. Your conversation history with them remains in your chat list, but they will not see any messages you sent while they were blocked.

Unblocking does not notify the person that you unblocked them. They will only know if they try to message you and see that messages are delivering again.

Frequently Asked Questions

Can someone tell if I blocked them?

WhatsApp does not send a notification, but they may figure it out if they try to message you and see that their messages are not delivering, or if they notice they cannot see your profile picture or last seen time. There is no way for them to know for certain without trying to contact you.

If I block someone, can they still see old messages I sent before the block?

Yes. Blocking only stops new messages from reaching them — it does not delete or hide messages they received before you blocked them. They can still see and read everything you sent in the past.

What if I block someone by accident?

Go to Settings > Privacy > Blocked Contacts (or Account > Privacy > Blocked Contacts on Android), find their name, and tap Unblock. The process takes about ten seconds. They will not know you blocked them by accident.

Does blocking someone on WhatsApp block them on other apps too?

No. Blocking on WhatsApp only affects WhatsApp. They can still reach you through text message, email, phone calls, or any other app. WhatsApp blocking is separate from your phone's contact blocking.

If I block someone and then unblock them, will they know?

No. WhatsApp does not notify people when you unblock them. They will only know if they try to message you and see that messages are delivering again, or if you tell them yourself.