iPhone message warns of unauthorized access

Billromine wrote:

I had a message that someone was in my iPhone

No one is in your phone. It's a scam message designed to scare you into buying software or tools you don't need for a problem you don't have. Ignore the message. Block the caller, then delete it.

Read this --> Recognize and avoid social engineering schemes including phishing messages, phony support calls, and other scams - Apple Support