Viruses on iPhone

No.

It is a malicious ad designed to scare you into downloading useless software, steal your personal information and money.

Download an ad blocker.

Its an obvious scam.

1. It has bad grammar
2. ”to install trusted security app” that’s obviously a scam.

See for more info: Phony "tech support" / "ransomware" popup… - Apple Community

It’s fake. Close the tab on safari. Please don’t click anything!!