Is my iPhone 7 vulnerable to hacking through suspicious messages?

Whatever the scammers ask you to do, do not interact with them, and delete it. Those are scam attempts, your iPhone is not open to hacking.

Learn more: Recognize and avoid social engineering schemes including phishing messages, phony support calls, and other scams - Apple Support

Is my iPhone 7 vulnerable to hacking through suspicious messages?

No, as long you never provide any personal information that might be requested.

Scams are everywhere. Two good rules to follow:

NEVER click on a link in a message from an unknown sender

NEVER call the number in a message from an unknown sender

See this.

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

ga-Do-hi wrote:

Thank you. This last one just filled the screen while I was checking FB. It just said I had been compromised and to click. Knew better than to do that but this is the second odd thing in a week which has me freaked out. I can't update past 15.8 because of its age. Appreciate the help!

Glad to have helped, and do stay vigilant out there. You are most welcome!