Advanced calling Not accessible

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. 

Re: Advanced calling Not accessible
Community Leader
Community Leader

The connection to the Verizon Wireless network might not be able to work if it is off anymore.

I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.