How can you get rid of viruses on your iphone

I know what you mean. I get pop-ups, too. It's just a scam. iPhones can not get viruses. If the pop ups are in safari, by chance, it was just a dumb website that says that to scare you. Don't be worried, it's just a fake to scare you. I don't like whoever is doing that, as it happens to me twice, too.

iPhone -> Settings -> Safari -> Clear History and Website data

All such popups are scams. They are to be ignored. There is nothing wrong with your iPhone.

It's a scam.

There are no known viruses that can affect non-jailbroken iPhones.

So unless your iPhone is jailbroken there's nothing you need to do other than ignore the messages.