Answer first
Do not call phone numbers shown in pop-ups. Close the browser tab, avoid downloading tools from the warning page, review notification permissions, and run a trusted security scan from software already installed or officially sourced.
Avoid phone numbers, download buttons, payment prompts, and remote-access invitations in the pop-up.
Unwanted notifications often come from allowed website permissions, not necessarily a full device infection.
Save the warning wording if needed, but do not capture passwords, card numbers, or private files.
Quick FAQ
Is every virus pop-up real?
No. Many browser pop-ups are notification spam or unsafe pages designed to create panic.