Incoming callers get message that my number is not a subscriber

MarshaK wrote:

This message has happened with 3 callers that I am aware of.  They also don’t have the option of leaving a voice mail.

I am having this same issue on main phone, the line is paid, it's not on DNS (do not disturb), everything the said to do is done!

T-Mobile, I'm about to cancel. They won't help! The phone can call but can't be called. Any suggestions?

It's a iPhone 14 pro max?