Do you have "Enhanced VoLTE" or "VoLTE calling" option in Settings>Network and Internet>Mobile network? Because in my device it is not showing and forcefully disabled!@rpbritton
Thanks for the 4.19-build. Great battery improvement. Can't confirm 'complain' about charging: my screen lights up. At my phone mobile data is also working during phone-call (happily)
I made a clean install, first installed xiaomi firmware, 2nd extra firmware as advised because of other kernel, 3rd pixelexperience-plus. Only problem is to install all the apps all over again .