What should I do If I clicked on a Virus link on iPhone?

IF you get a message "you downloaded a virus" that is a scam message meant to scare you. don't click on anything, just click away the popup and close the link you'er opened, then you're most likely good. iPhones are not prone to viruses from Links and messages about viruses are scams trying to scare you and force you either to pay something or to install something that you don't want

That is a scam message. iPhones & iPads cannot be infected unless jailbroken.

You could delete the browser’s cookies, cache & history which should remove the message.