My iphone x is showing iphone unavailable

If you see an iPhone or iPad unavailable message or Security Lockout screen - Apple Support

"Unavailable" appears when there have been too many failed log on attempts.

Hi Bob,

I also use an iPhone XS as a second phone on my account - so far trouble-free.

Can you tell us what circumstances would cause our phone to go into this 'unavailable' condition?

The link you provided (thanks) doesn't give us any clues on what might get us - or has got @barilugbene's phone - into this situation.

Thanks.

Your question has been answered. Follow the instructions in the link that I provided.

I see.

Thank you.

(In hindsight that 'cause' was only vaguely implied (IMHO) in the title of the article you referred us to. But I see now.)