I received a message that my iPhone is infected with a Trojan Virus

It is fake. Somebody is trying to scare you into buying something you do not need or trying to steal your personal information.

Scams (e-mail, text messages, and phone calls) are getting very good at closely imitating true Apple communications. Always be cautious. These support articles have some guidelines:

About identifying legitimate emails from the App Store and iTunes Store --> Identify legitimate emails from the App Store or iTunes Store - Apple Support

Recognize and avoid phishing messages, phony support calls, and other scams - Recognize and avoid phishing messages, phony support calls, and other scams - Apple Support

Avoid scams when you use Apple Cash --> Avoid scams when you use Apple Cash - Apple Support

Apple 'How to identify, avoid, and report phishing' video--> https://youtu.be/SR3Z3fXXjfw

About Gift Card Scams --> About Gift Card Scams - Official Apple Support

If you are uncertain about a message and a resource provided in that message, do not click on any links in the message. Try to independently verify the resource by going to a support article page on apple.com and use the instructions in the article to verify though Apple itself, or your Apple device features such as Settings or an Apple app, what the message is claiming. To ask Apple start at this web page: Official Apple Support

LetaDan Said:

"Trojan virus: I received a message that my phone is infected with a Trojan virus. How do I check if it is real?"

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This is a scam.

Apple device wouldn't send you such as message on its own.

So, Report this to Apple and Others:

Forward a screenshot of the as an attachment to Apple using this eMail address: reportphishing@apple.com. In the comments pane, inform Apple of what the attachment is all about: an eMail containing a screenhot of a scam . Use my User Tip: Using the Photos App to Report Scams: - User Tips

Your phone does not have a virus.

You are looking at a classic SCAM that is trying to trick you into buying useless software or worse.....revealing personal information that might be use to compromise your phone.

Never click on a link in a message like this. Delete the message and any others like it that you will receive in the future.

Scam!

The sandboxing in an iPhone that was not jail broken would make it extremely difficult, if not impossible, for any virus to spread from one app to another.

The message might use the System Settings icon or the Apple logo to confuse and frighten you, but it is likely to be a fraudulent Web notification sent by scammers and spammers. I think there may be settings you can use to block those.

LetaDan Said:

"Thank you for your responses. I suspected as much but I haven’t gotten a message like this previously."

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As I said: "Apple device wouldn't send you such as message on its own."