Your iPhone has been compromised

WheelieNick is correct. It is a scam to steal your money, your personal data, or your identity (or all 3). Ignore it and close the tab or delete the message. Here’s more information→Avoid phishing emails, fake ‘virus‘ alerts, phony support calls, and other scams

I read on the internet that this can be a scam. So don't click on any links or buttons provided in the message just to be sure.