Blocking stops messages and calls from reaching you, but the person can still see you were online

When you block a number on WhatsApp, that person cannot send you messages, make calls to you, or see when you were last active. Their messages do not arrive in your chat list — they go nowhere. But blocking is not invisible: if they try to call you, they will hear a ring tone even though the call never reaches your phone, and they may eventually notice they cannot see your profile picture or status updates.

Blocking is different from muting a chat (which silences notifications but lets messages through) or deleting a chat (which removes it from your screen but does not stop new messages). If you want the person to stop contacting you entirely, blocking is the right tool. If you just want to hide notifications from someone you might talk to again, muting works better.

Key Takeaways

  • Blocking a number on WhatsApp prevents that person from sending you messages or calling you, but they will not receive a notification that you blocked them.
  • The blocked person can still see that your account exists and may notice they cannot see your profile picture, status, or last-seen time.
  • You can block someone from their contact card, from inside a chat with them, or from your blocked list — all three routes take less than 10 seconds.
  • If you change your mind, you can unblock the same number at any time, and old messages from that person will reappear in your chat history.

How to block a number on iPhone

Open WhatsApp and go to the Chats tab. Find the conversation with the person you want to block, swipe left on their name (or long-press if swiping does not work), and tap the trash icon to delete the chat. This does not block them — it only removes the conversation from your screen.

To actually block them, open WhatsApp and tap Settings at the bottom right. Go to Privacy, then Blocked Contacts, and tap Add. Select the person from your contacts list. You can also block someone directly from a chat: open the conversation, tap their name at the top, scroll down, and tap Block Contact.

How to block a number on Android

Open WhatsApp and find the chat with the person you want to block. Long-press their name until it highlights, then tap the three dots at the top right and select Block. The chat will stay in your list but marked as blocked.

Alternatively, open the chat with that person, tap their name at the top, scroll to the bottom, and tap Block [Name]. You can also block from your contacts: open WhatsApp, go to Settings, tap Privacy, then Blocked Contacts, and tap the plus icon to add someone from your phone's contact list.

What the blocked person will and will not see

The blocked person will not receive a notification saying "you have been blocked." They will not see a message in the chat saying so. But if they try to call you, they will hear a ring tone and then silence — the call will not connect. If they send a message, it will appear to send on their end (they will see a single checkmark), but it will never reach you.

Over time, they may notice they cannot see your profile picture, your status updates, or the time you were last active on WhatsApp. If they visit your profile, it will look empty. These signs often tip people off that they have been blocked, even though WhatsApp does not say so directly.

How to unblock a number if you change your mind

Go to Settings, then Privacy, then Blocked Contacts. You will see a list of everyone you have blocked. Tap the person's name and select Unblock. Once you unblock them, they can message and call you again, and you will see all the old messages they sent you while blocked.

Unblocking does not send them a notification either. They will not know you unblocked them unless they try to contact you and you respond. If you unblock someone and then want to block them again, you can do it the same way.

Blocking versus reporting: when to use each one

Blocking stops someone from contacting you. Reporting tells WhatsApp that the person is sending spam, scams, or abuse. If someone is harassing you, you can block them. If they are also sending messages that break WhatsApp's rules — like spam, threats, or sexual content — you should report them too.

To report someone, open the chat, tap their name at the top, scroll down, and tap Report Contact. WhatsApp will review the messages and may disable their account if they find a pattern of abuse. Reporting does not delete the messages from your phone; it sends copies to WhatsApp's team. You can report and block the same person at the same time.

What happens to old messages after you block someone

Messages from a blocked person stay in your chat history. You can still read them, search for them, and scroll back through the conversation. Blocking does not erase the past — it only stops new messages from arriving. If you delete the chat, the messages are gone, but that is a separate action from blocking.

If you unblock the person later, any messages they sent while blocked will still be there, and new messages will start arriving again. This is useful if you block someone by mistake or if you want to keep the conversation history but prevent new contact for a while.

Frequently Asked Questions

Can someone tell if I blocked them on WhatsApp?

WhatsApp does not send a notification, but they may figure it out. If they try to call you, they will hear a ring tone that never connects. If they notice they cannot see your profile picture or last-seen time, they may suspect blocking. There is no way to know for certain without trying to contact you.

If I block someone, can they still see my profile picture and status?

No. Once you block someone, they cannot see your profile picture, status updates, or when you were last active. Your profile will appear blank to them. This is one of the clearest signs to a blocked person that something has changed.

What is the difference between blocking and muting a chat?

Muting silences notifications from a chat but lets messages through — you can still read them if you open the app. Blocking stops messages from arriving at all. Use muting for people you want to hear from less often; use blocking for people you do not want to hear from at all.

Can I block someone without deleting our chat history?

Yes. Blocking and deleting are separate actions. You can block someone and keep all your old messages with them. The messages will stay in your chat list (marked as blocked) until you delete the chat yourself.

If I unblock someone, will they know?

No. Unblocking does not send a notification. They will only know if they try to contact you and you respond, or if they notice they can see your profile picture and status again.