Thanks - I've taken to do exactly that. Was just looking for the phone to do the right thing on its own as I sometimes forget to turn off Airplane Mode when leaving the house or entering Airplane when I come home. What I have done to make things more convenient is: Using ADB, configured the phone to leave on WiFi and Bluetooth when enabling Airplane Mode. You don't have to be root for that. Created a Bixby routine called Airplane Mode. Doesn't to anything but toggle Airplane mode on/off, but I can put this on my home screen to make life a bit easier. ... View more

You can get to this setting with One UI (and probably any other launcher) with the "WiFi Calling" App by Widget 7 : https://play.google.com/store/apps/details?id=com.widget7.wifi.calling&hl=en_US&gl=US ... View more