Is this a Microsoft Defender phone number 844-449-1829?

Sherry Fizdale 0 Reputation points
2026-08-07T18:58:34.73+00:00

Something suddenly took over my desktop computer and a voice repeated over and over that MS Defender had taken over, I was in danger of losing my Facebook account, and I must not disconnect from the internet or shut down my computer but call 844-449-1829. I called, a man with a very South Asian accent told me his name was John Anderson, so I discounted the call, unplugged my computer, and pulled out the internet plug. Could this possibly have been legitimate?

Windows for home | Windows 11 | Security and privacy
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  1. Erland Sommarskog 136.2K Reputation points MVP Volunteer Moderator
    2026-08-07T19:14:30.5866667+00:00

    A very good move to hang up the call! No, it is definitely not legitimate! Had you stayed in the call, things could have gone very bad.

    Most likely this was a popup from a web site you should not have visited. Find all browser windows and close them down. It is also good to use Task Manager to delete any remaining processes. Or simply reboot the computer.

    It also a good idea to run a full scan with your anti-virus tool.

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  2. AI answer

    2026-08-07T18:58:53.36+00:00

    No. That was a tech support scam, not legitimate Microsoft Defender behavior.

    Key signs from the scenario:

    1. Microsoft error and warning messages never include phone numbers.
    2. Microsoft and legitimate tech companies do not cold call or use unsolicited alerts telling people to call a number for support.
    3. Fake support scams often use full-screen pop-ups, repeated audio, and urgent claims such as account compromise to pressure immediate action.
    4. Scammers commonly tell people not to disconnect from the internet or shut down the computer so they can keep control of the situation.

    What to do next:

    1. Do not call that number again and do not allow remote access.
    2. If the pop-up is still present, close the browser. If it will not close, press Alt+F4. If needed, restart the PC.
    3. Run a full scan with Windows Security.
    4. Install all available Windows Update security updates.
    5. If any software was installed at the scammer’s request, uninstall it.
    6. If any passwords were entered or shared, change them immediately.
    7. If any payment information was given, contact the card provider to contest charges and replace affected cards.
    8. Report the scam at https://www.microsoft.com/reportascam.

    If no remote access was granted, no software was installed, and no credentials or payment details were shared, disconnecting and ending the interaction was the correct response.

    AI-generated content may be incorrect. Read our transparency notes for more information.

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