How to check if I have a virus on my iPhone?

I would like to know if there's a way of checking if my iPhone has a virus. I use a site called Putlocker to watch movies and tv shows. That site has lots of pop ups. Few pop ups go something like "Congratulations you have been hand picked by Facebook to win a prize" then I have to click OK (no cancel button)

Anyways my Mom said she watched on the news a while back about something similar like that, only it was a text message and the individuals information were stolen when they clicked on the link.

Now I don't fall for those kind of stuff, but I'm still worried that my phone could have a virus. I have a iPhone 5s IOS version 8.3. Can my service provider (Boost Mobile) do something or will I just be wasting money and time?

You can probably download an antivirus from the App store, but I have none to recommend.
Just so you know, you're more likely to come across these sites by watching content illegally *hint*hint*.

Go to the app store and look for an antivirus.

IPhones don't get viruses. Boom. I just blew your mind. True stuff though.

Install virus scan apps