When I try to click on advanced calling in connection settings, the advanced calling screen flashes up for a second and then I'm returned to the previous page. If I try to click advanced calling again, nothing happens.
If I kill the settings app and try again, I get these same two results. I've tried starting in safe mode, same result.
What is preventing me from accessing these options? I can still use wifi calling (I was prompted to turn it on by my phone), but have no control to turn it on or off as desired.
