https://learn.microsoft.com/ja-jp/dotnet/api/android.telephony.phonestatelistener.oncalldisconnectcausechanged?view=net-android-35.0
PhoneStateListener.OnCallDisconnectCauseChanged(Int32, Int32) Method (Android.Telephony) |...
Callback invoked when call disconnect cause changes on the registered subscription.
methodandroidtelephony