Are you able to set the default SIM for calls in Ubuntu System Settings? Settings -> Cellular -> Default for calls.
Also, for debugging, here's how to list the actual setting: $ $ gsettings get com.ubuntu.touch.phone default-sim-for-calls
Are you able to set the default SIM for calls in Ubuntu System Settings? Settings -> Cellular -> Default for calls.
Also, for debugging, here's how to list the actual setting: touch.phone default- sim-for- calls
$ $ gsettings get com.ubuntu.