How do I check if my iPhone has virus?

Have you let someone use your phone for a hour or so and also provided your Passcode, Apple ID and Password?

If not, you don't have a virus on your phone.

Still not convinced? Run Safety Check.

Safety Check for an iPhone with iOS 16 or later - Apple Support

If you are seeing messages that your phone has a virus, those are probably scams, presented by criminals. The idea is to use your fear of viruses to frighten you into lowering your guard, and paying for some worthless “security” app - or into contacting them so they can rip you off more directly.

It does not, unless you have decided to actively jailbreak your phone. We may be able to help you if you tell us what you are concerned about.

A non-jailbroken phone cannot be hacked, get malware, or a virus. Why do you think you have one?