When you block someone on WhatsApp, they can no longer message you, call you, or see your profile information
Blocking on WhatsApp is a one-way action. The person you block cannot send you messages, make voice or video calls, or see when you were last active. They also cannot see your profile photo, status updates, or "about" information. However, they will not receive a notification that you blocked them — WhatsApp does not tell people they have been blocked.
The blocked person can still see old messages you sent them before the block took effect. They can still see group chats you are both in, and they can still see your name in those groups. If you are in a group together, they may not realize you blocked them individually unless they try to message you and the message fails to send.
Key Takeaways
- A blocked person cannot message you, call you, or see your current profile photo, status, or last-seen time.
- WhatsApp does not notify the blocked person that you blocked them, though they may figure it out if messages fail to send.
- Old messages from before the block remain visible to both of you, and you both stay in any group chats together.
- You can unblock someone at any time, and they will when ready be able to message and call you again.
- Blocking is different from muting — a muted contact can still reach you, but their messages do not trigger notifications.
What the blocked person can and cannot do
A blocked person cannot send you new messages. If they try, the message will appear to send on their end, but it will never reach your phone. They will not see a "delivered" checkmark or a "read" checkmark — from their perspective, the message may seem to be processing indefinitely, or they may see an error after several minutes.
They cannot call you. If they try to make a voice or video call, 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. WhatsApp does not tell them the call was blocked — it straightforward does not go through.
They cannot see your profile photo, status, or last-seen timestamp. If they open your chat, they will see the conversation history but your profile will show a blank or default image. Any status updates you post will not be visible to them. If they check your last-seen time, it will show nothing.
They can still see messages you sent before you blocked them. The entire chat history remains on both phones. They can read old messages, search through them, and see photos or files you shared previously. Blocking only stops new communication — it does not erase the past.
How blocking works in group chats
If you and the blocked person are in the same group chat, you both remain in that group. The block does not remove either of you from the group. You will still see their messages in the group, and they will still see yours. The block only affects direct one-to-one communication.
In a group, they can still see your profile photo, status, and other information. The block only hides these things in direct chats. If you want to prevent someone from seeing your information in groups as well, you would need to leave the group or remove them from it — blocking alone does not do that.
The difference between blocking, muting, and archiving
Blocking stops all communication. Muting a contact is different — a muted contact can still message you and call you, but their messages will not trigger notifications. You will still see their messages when you open WhatsApp, but you will not get a sound or vibration alert. Muting is useful if someone is not bothering you but you do not want constant notifications.
Archiving a chat hides it from your main chat list but does not stop communication. If an archived contact messages you, the chat will reappear at the top of your list. Archiving is for organization, not privacy. You can archive a chat, mute it, or block it independently — these are three separate tools.
How to block someone on WhatsApp
On an iPhone, open WhatsApp and find the contact or chat you want to block. Swipe left on their name (or tap and hold, then select "More"). Tap "Block Contact". A confirmation screen will appear asking if you are sure — tap "Block" again to confirm.
On Android, open WhatsApp and find the contact. Tap their name at the top to open their profile. Tap the three-dot menu icon and select "Block". Confirm when prompted.
You can also block someone from a group chat. Tap their name in the group member list, then tap "Block Contact" (iPhone) or the three-dot menu and "Block" (Android).
How to unblock someone
On iPhone, go to Settings, then Accounts, then Privacy, then Blocked. You will see a list of everyone you have blocked. Swipe left on the name and tap "Unblock".
On Android, go to Settings, then Account, then Privacy, then Blocked Contacts. Tap the person you want to unblock and select "Unblock Contact".
Once you unblock someone, they can when ready message and call you again. They will not be notified that you unblocked them. Old messages will still be there, and they will regain the ability to see your profile photo, status, and last-seen time.
What happens if you block someone by accident
If you block someone by accident, you can unblock them right away using the steps above. There is no time limit — you can unblock them when ready or weeks later. They will not know you blocked them, and they will not know you unblocked them. From their perspective, if they tried to message you while you were blocking them, the message straightforward failed to send, and once you unblock them, new messages will go through normally.
If you want to explain what happened, you can message them after unblocking. But WhatsApp itself will not tell them anything about the block or the unblock.
Frequently Asked Questions
Will the person know I blocked them?
WhatsApp does not send a notification when you block someone. However, they may figure it out if they try to message you and the message fails to send, or if they notice they can no longer see your profile photo or status. There is no official way for them to know for certain.
Can I block someone without them seeing old messages?
No. Blocking does not delete old messages. The person you block can still see every message you sent them before the block took effect. If you want to erase the conversation, you would need to delete the chat yourself before blocking them — but they will still have their own copy of the messages on their phone.
What if I block someone in a group chat?
Blocking someone does not remove them from the group or you from the group. You will both stay in the group and see each other's messages there. The block only prevents direct one-to-one messages and calls. If you want to stop seeing their messages entirely, you would need to leave the group.
Can I block someone temporarily?
Yes. You can block someone and then unblock them later. There is no time limit on how long you keep someone blocked. You can unblock them whenever you want, and they will when ready be able to message and call you again.
Does blocking delete my chat history with them?
No. Blocking keeps the chat history intact on both phones. You can still see all old messages, photos, and files. If you want to delete the conversation, you need to manually delete the chat — blocking alone does not erase anything.