Blocking stops someone from contacting you on WhatsApp

When you block a contact on WhatsApp, that person cannot call you, message you, or see when you are online. They cannot see your profile picture, status updates, or "last seen" timestamp. If you block someone, they will not receive a notification that you blocked them — but they may figure it out when their messages do not go through or when they notice your profile information is no longer visible to them.

Blocking is permanent until you unblock the person. You can unblock them at any time, and they will be able to message and call you again. Blocking does not delete your chat history with that person, though you can delete the conversation separately if you want to remove it from your chat list.

Key Takeaways

  • Blocking someone on WhatsApp takes three taps on your phone and stops them from calling, messaging, or seeing your online status.
  • The blocked person will not get a notification, but they will notice when their messages fail to send.
  • You can unblock someone at any time, and blocking does not erase your chat history with them.
  • On iPhone, you block through the contact's chat; on Android, you can block from the chat or from your contacts list.
  • If someone is harassing you, blocking is a first step, but you can also report them to WhatsApp or delete the app conversation entirely.

How to block someone on iPhone

Open WhatsApp and find the chat with the person you want to block. Swipe left on their name (or long-press on it), and a menu will appear. Tap More, then tap Block. Confirm by tapping Block Contact in the popup that appears.

If you prefer to block from your contacts app instead, open Contacts, find the person's name, tap Edit, scroll to the bottom, and tap Block this Caller. This blocks them across your phone, not just in WhatsApp, so they also cannot call you through your regular phone line.

How to block someone on Android

Open WhatsApp and find the chat with the person you want to block. Long-press on their name until it highlights, then tap the three-dot menu at the top of the screen. Select Block and confirm.

You can also block from your contacts list: open Contacts, find the person, tap the three-dot menu next to their name, and select Block. Like iPhone, this blocks them across your phone unless you only want to block them in WhatsApp, in which case use the first method.

What happens after you block someone

The blocked person's messages will show a single checkmark (meaning sent) but never a double checkmark (meaning delivered). Their calls will not ring through to you — they will see a message saying the call failed. If they try to add you to a group chat, they will not be able to do so.

The blocked person can still see old messages you sent them before the block, but they cannot see messages you send after blocking. They cannot see your profile picture, status, or "last seen" time. If they visit your contact card in their phone, your information will appear grayed out or limited.

How to unblock someone

On iPhone, open WhatsApp, tap Settings at the bottom right, then Privacy, then Blocked. Find the person's name and swipe left, then tap Unblock.

On Android, open WhatsApp, tap the three-dot menu at the top, select Settings, then Account, then Privacy, then Blocked contacts. Long-press the person's name and tap Unblock.

Once you unblock someone, they can message and call you again, and they will be able to see your profile picture and status. Your chat history with them remains in your chat list unless you deleted it separately.

When to block versus mute or delete a chat

Blocking is the right choice if someone is harassing you, sending unwanted messages, or you do not want them to contact you at all. Muting is gentler — it silences notifications from that chat but the person can still message you and see your online status. To mute, long-press the chat, tap the bell icon, and choose how long to mute (usually 8 hours, 1 week, or always).

Deleting a chat removes it from your list but does not block the person — they can still message you and you will see the new message appear. Use delete if you want to clean up your chat list but are open to hearing from that person later. Use block if you want to cut off contact entirely.

What to do if someone is harassing you

Blocking stops the immediate problem, but WhatsApp also lets you report someone for harassment. Long-press their chat, tap the three-dot menu, and select Report. Choose the reason (spam, harassment, or abuse) and WhatsApp will review the account.

If the harassment is severe or involves threats, take a screenshot of the messages and report them to your local police. WhatsApp keeps message records and can provide them to law enforcement if needed. You can also delete the entire conversation after reporting if you do not want to see the messages anymore.

Frequently Asked Questions

Will the person know I blocked them?

They will not get a notification, but they will likely figure it out when their messages show only one checkmark and never deliver, or when they cannot call you. They may also notice your profile picture and status are no longer visible to them.

Can I block someone without deleting our chat history?

Yes. Blocking does not erase your conversation. The chat stays in your list unless you delete it separately. If you unblock them later, the history is still there.

What if I block someone by accident?

You can unblock them immediately by going to Settings > Privacy > Blocked (iPhone) or Settings > Account > Privacy > Blocked contacts (Android), finding their name, and tapping Unblock. They will be able to message you again right away.

Can someone message me if I block them on WhatsApp but not on my phone?

If you only block them in WhatsApp (not in your phone's contacts), they can still call you through your regular phone line, but they cannot reach you through WhatsApp. If you block them in your phone's contacts app, they cannot call or text you through any method.

Does blocking someone delete their number from my phone?

No. Blocking only affects WhatsApp and (if you use your phone's block feature) your calls and texts. Their contact information stays in your phone unless you delete it manually.