4G voice calls stopped working

[joe@adelaide]

I have installed mobian on an sd card.  I was able to get voice calls to work.  Then I experiment with setting up access points using various apn settings for my carrier. I managed to get mobile data to work.  However, I discovered that I could not longer receive or place phone calls.  I am totally baffled and out of my depth.  I haven't included any real configuration information because I'm not sure what is relevant.

[joe@adelaide]

I fixed the problem by re-installing mobian.