Right, so WiFi calling works like a charm. I don't know about voltLTE I'm in AT&T land and have been roaming for over a month.
My apps are being a little buggy though so I checked it out and the support page has autoloader AAF153 I think that's the official 6.0 release so, I'm going to try and install that then reinstall my apps with filtered permissions to see if that removes the bugs.
Because if updating android is anything like updating windows, I'd rather just fresh install the new OS