Does my iPhone have a virus

Unless you have jailbroken your phone, no you don't. These are Phishing Scams designed to get you to pay for things you simply don't need. See this link for more information --> Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

No, it doesn't. Those are scams.

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Not a virus as there are no known virus for non-jailbroken iPhones.

I'm sure you're just fine. Stop worrying. This is why iPhone has the best, most secure operating system of any phone out there. It's very very very very hard to penetrate the walled garden.

Possible, but easily remedied if you get something. Most often, people see spam calendar entries. If you see anything you don't recognize in your calendar it's easy to fix.