WIFI Calling button will NOT stay on
Hello.
My father has an Iphone X, and my mother an Iphone 7s. They recently
got an high speed internet connection, and I was trying to setup
Wifi-calling for them.
My mothers phone worked fine first try. However, on the 'Iphone X' I
am having a problem where the 'Wifi-calling' button wont stay
highlighted. I enable it, back out, check it again, and it disables
itself.
I have confirmed with their carrier Wifi-calling is available, and it
works on my mothers iphone fine in the same house-hold, and carrier. I
have tried bringing my phone into US Cellular to troubleshoot it (they
were 0 help), and say there is no problem on their end.
I have tried resetting network settings, turning off/on, hard reset,
etc. I googled, and found a few other people having similar issues, but
never a concrete fix. Nothing I do seems to work. Any advice?