WhatsApp Now Shows a Warning Screen Before You Open a Chat with an Unknown Number

2026-06-28 · 6 min de leitura · Camila Torres

Digital Safety

A notification pops up. A number you don't recognize just sent you a message on WhatsApp. Before you can open it, a screen appears. It shows where the number is registered, whether you have any shared groups, and if the contact is saved in your phone. Only then do you get the option to continue or cancel.

This is WhatsApp's new unknown number warning system. Meta started rolling it out to Android and iOS devices in June 2026, and it changes how scams start on the platform.

What the New Warning Screen Shows

Unlike older alerts that appeared after you opened a conversation, this one blocks the chat entirely until you make a choice. The screen displays three pieces of information about the number trying to reach you:

• Country of origin: where the phone number is registered, so you can spot international numbers pretending to be local contacts.
• Contact status: whether the number is saved in your address book or not.
• Shared groups: any WhatsApp groups you and the sender both belong to, which helps confirm if this is someone you actually know.

From there you can tap Continue to open the chat or Cancel. If you cancel, the other person gets no notification. The scammer never knows you saw the warning and chose not to engage.

Why This Changes How Scams Start

Most WhatsApp scams do not begin with an obviously fake message or a suspicious link. They start with something simple. A greeting from an unknown number. Then the story unfolds: a changed phone number, an urgent request for money, a verification code supposedly sent by mistake.

The scam depends on you not having time to think. The new warning screen forces a pause before any of that can happen. It shows you the facts about the number while you still have a clear head.

Security researchers call this positive friction. A small deliberate obstacle that makes you stop and evaluate instead of acting on impulse. In this case the obstacle takes about two seconds to read and could save someone a lot of money.

How It Differs from Earlier WhatsApp Alerts

WhatsApp already had several layers of protection. A banner inside active chats. Encryption warnings. Unknown sender labels. All of them shared the same weakness: they appeared after the conversation was already open.

By that point the damage is partly done. You have already seen the message, read the story, and started processing the urgency. The new screen flips that order. The warning comes first, before you see a single word of what the sender wrote.

Scams This Feature Directly Targets

The warning screen is most effective against scams that rely on an unknown number making first contact. According to the Federal Trade Commission, 67% of all reported scams in 2023 started with a text message or messaging app. The median loss was $1,000 per victim.

• Changed number scam: Someone pretends to be a friend or relative who got a new phone and needs money urgently for an emergency. The country code often gives it away when the number is registered abroad.
• Verification code trick: A message from an unknown number asks you to confirm a code that just arrived on your phone. That code is actually the scammer trying to register your WhatsApp number on their device.
• Phishing links: Random numbers send URLs that look like delivery tracking pages, bank login screens, or government portals. The warning screen buys you time to recognize you were not expecting any message from that source.
• Fake job offers: Recruitment messages from unknown contacts that promise easy money and ask for a registration fee or personal documents upfront.

What the Warning Screen Does Not Do

No security feature is perfect, and this one has clear limits worth knowing.

• It does not activate for saved contacts. If someone gets hold of a number already in your address book, the warning will not appear. Always verify urgent requests through a separate channel even when the contact name looks familiar.
• It cannot verify identity. The screen shows facts about the number, not about the person holding the phone. A number in your country with shared groups can still belong to a scammer who joined the same public groups you are in.
• It does not replace common sense. Urgent money requests, demands for verification codes, and unexpected links are red flags regardless of what any warning screen shows.

How to Check If You Already Have the Feature

The feature is rolling out gradually and does not require any manual setup. It activates automatically when WhatsApp detects you are trying to start a chat with an unknown number.

1. Open Google Play or the App Store and search for WhatsApp.
2. Tap Update if the option is available. If not, the latest version is already installed.
3. Make sure automatic updates are enabled in your phone settings.
4. Try adding an unfamiliar number to test whether the warning screen appears before the chat opens.

What to Do When the Warning Screen Appears

The screen is designed to inform you, not to scare you. Here is what to look for before you decide:

• Check the country code. A number registered in a different country claiming to be a local contact is one of the strongest scam signals there is. Watch out for codes like +62, +233, +212, or +7 appearing in conversations that have no reason to be international.
• Look at shared groups. If someone claims to be a close friend but you share zero groups, that is worth questioning.
• Confirm through another channel. Call the person using their old number or send a message through a different app before continuing the chat on WhatsApp.
• When in doubt, cancel. Canceling does not block the number permanently. You can always come back later if you verify the identity. And the sender will not know you saw the warning.

Why Meta Took This Long

Meta first hinted at additional protections for unknown number contacts back in August 2025. Nearly a year later the feature is finally reaching users. The delay likely reflects the challenge of implementing real time verification across billions of daily conversations without slowing down the app.

The launch also fits into a broader push on safety that the platform has been making. Recent months brought stricter filters for messages from unknown senders, more frequent two step authentication prompts, biometric locked folders, and automatic blocking of suspicious links.

One Screen. Two Seconds. A Real Difference.

The new WhatsApp warning screen is not a complicated tool. It shows you a few facts about a number and asks you to decide before proceeding. That simplicity is what makes it work. Scams rely on speed and confusion. A pause with clear information is often all it takes to break the spell.

When you see the warning, read it. When you are not sure, cancel.