JUST AN FYI
"This is a public forum. Please do not post personal information such as name, phone #, email/physical address or account number."
kmdtonkin, it sounds like your features on your iPhone X need to be realigned. Is the same issue with VoLTE appearing on your fiance's phone as well?
Was that additional line issue resolved? Please send me a private message with your full name and phone number tied to your residential services for help.