Removing viruses from iPhone

You cannot get a virus on your phone. The sandbox that iPhones operate in does not support inserting viruses. You also cannot use any type of anti-virus software to attempt to find one, since the anti-virus would not have access to the file system of the iPhone.

What makes you believe you have a virus? Did you receive a popup warning you of one? If yes, it was a scam, attempting to get you to download or purchase some app.

You need to explain the problem you are seeing. The system files are locked on a read only partition of your drive so there is no way they can be modified like what used to be done with viruses. No Antivirus software is able to scan your device and there simply is no use for them like they were with the old Windows machine. Although you will still find some that will take your money, it is just snake oil on your iPhone.