How to Block Someone on WhatsApp

Blocking takes a couple of taps and requires no explanation to anyone: the other person gets no notification and sees no special status. What's worth understanding is everything around it — what stops working, where blocking has no power, and when gentler tools are enough.

The short answer

Open the chat, tap the person's name at the top of the screen, scroll down and choose Block. Confirm.

The blocked contacts list in your privacy settings does the same job — and that's where you undo it later.

Three ways to block

From the chat. The quickest route: the name at the top of the screen → the contact card → the block option at the bottom.
From settings. Privacy → blocked contacts → add the person from your list. Handy when the chat is gone or you deleted it.
Straight from an incoming message. When an unknown number writes, WhatsApp shows block and report buttons above the input field — no need to save the contact first.

The steps are the same on Android and iPhone; in the business app, blocking sits in the customer's card in exactly the same place.

Blocking and reporting are different

When you block, the app often offers to report as well. They aren't the same thing:

Blocking is your personal setting. It closes that person's access to you and concerns nobody else.
Reporting is a message to the platform. A few recent messages from that chat go for review, and the service decides what happens to the account.

For spam and fraud, doing both makes sense: blocking protects you, reporting helps stop the campaign more broadly.

What happens after you block

their messages and calls stop reaching you;
they can no longer see your profile photo, About text, "online" status or last-seen time;
your status updates are no longer shown to them;
you also can't write or call them until you unblock;
they receive no notification — they can only work it out from indirect signs.

The conversation itself doesn't disappear: the chat stays on both sides. If it bothers you, archive or delete it separately.

What blocking doesn't do

It doesn't apply in shared groups. If you're both in the same chat, you'll keep seeing each other's messages. Leaving the group is the only way around that.
It blocks a number, not a person. From another number they can write to you again.
It doesn't affect ordinary calls and texts. This is a messenger setting; phone calls are blocked through your device.
It doesn't remove the contact from your phone book. The number stays there until you delete it by hand.
It doesn't erase what was already sent. Earlier messages remain in the conversation.

Checking who you've already blocked

The blocked contacts list lives in your privacy settings and shows everyone at once. Looking at it occasionally is worthwhile, for a few reasons:

accidental blocks happen more often than you'd think — the button sits right beside other options on the contact card;
numbers get reassigned to new owners, so a year later an old dispute may be attached to a complete stranger;
sometimes you find a number in there that you now need for work.

How to unblock

Open settings and go to the privacy section.
Choose the blocked contacts list.
Tap the person and confirm the unblock.

The conversation works again afterwards, but the messages they sent while blocked won't appear: nothing is delivered retroactively. No notification about the unblock is sent either.

Gentler options

Mute the chat. Messages arrive, the phone stays quiet — right for work conversations you can't cut off.
Archive the chat. It drops out of sight, and the archive can be set so new messages don't pull it back up.
Tighten your privacy. Photo, status and last-seen can be hidden without blocking — from everyone, or from anyone not in your contacts.
Silence unknown callers. A separate setting quietly filters calls from unfamiliar numbers without touching messages.

These help when ending the conversation isn't possible or desirable, but you'd rather not spend attention on it either.

Spam, broadcasts and scammers

Bulk campaigns usually come from numbers that change daily, so a single block doesn't solve it. What works is a combination:

block and report — that puts the number in front of the platform;
don't reply and don't tap links: any response confirms the number is live;
review your privacy settings so strangers can see less about you;
don't publish your personal number in public places — that's where the mailing lists come from.

If the spam is work-related — the number is in your listings, on your site or in directories — it's the personal profile that suffers most. In those cases customer contact moves to a separate number: the WhatsApp accounts available on Fire Accs cover that, and your personal number stays out of public view.

If they keep writing from new numbers

Blocking closes one number, so persistent contact needs more than that. The order of action:

Block and report each new number — the platform builds a picture that way.
Close your privacy settings: photo, status, last-seen and who can add you to groups should all be limited to your contacts.
Don't reply at all. Any reaction confirms the number is live and feeds the persistence.
Keep evidence: screenshots with dates and numbers matter if this reaches your carrier or the police.
With threats or blackmail, don't stop at app settings — that's a matter for law enforcement, not for a privacy toggle.

Common mistakes

Expecting the person to vanish from shared groups. Blocking doesn't work there.
Deleting the chat instead of blocking. Deleting a conversation doesn't stop anyone writing again.
Blocking scammers without reporting them. A report is the only way the platform hears about them.
Assuming the other person is notified. No message about a block is ever sent.
Unblocking "to see what they wrote". Messages from the blocked period won't arrive anyway.

FAQ

Will the person know I blocked them?

They get no notification. They can infer it from a single tick on their messages, an empty profile and calls that don't connect.

How many people can I block?

There's no practical limit for ordinary use: the blocked contacts list grows freely.

Do old messages survive a block?

Yes, the conversation stays on both sides. Deleting it is a separate action.

What if we're in the same group?

You'll keep seeing each other's messages: blocking has no effect inside groups.

Can I block a number that isn't in my contacts?

Yes, the block button appears in the chat with an unknown number — saving the contact isn't required.

Does this block ordinary phone calls?

No, only calls inside the messenger. Phone calls and texts are blocked through the device itself.

What happens if I change my number?

The blocked list belongs to the account and moves with it during an official number change.

The takeaway

You can block someone from the chat, from settings, or straight from a message sent by an unknown number, and nobody is notified. Two limits are worth remembering: blocking doesn't apply in shared groups, and the person can write from another number. If cutting contact entirely isn't necessary, muting, archiving and privacy settings do the job more quietly.