diff --git a/src/com/android/phone/ImsUtil.java b/src/com/android/phone/ImsUtil.java
index 4c9089f..8ee7773 100644
--- a/src/com/android/phone/ImsUtil.java
+++ b/src/com/android/phone/ImsUtil.java
@@ -60,6 +60,21 @@
     }
 
     /**
+     * @return {@code true} if WFC is provisioned on the device.
+     */
+    public static boolean isWfcProvisioned(Context context) {
+        CarrierConfigManager cfgManager = (CarrierConfigManager) context
+                .getSystemService(Context.CARRIER_CONFIG_SERVICE);
+            if (cfgManager != null
+                    && cfgManager.getConfig().getBoolean(
+                            CarrierConfigManager.KEY_CARRIER_VOLTE_OVERRIDE_WFC_PROVISIONING_BOOL)
+                    && !ImsManager.isVolteProvisionedOnDevice(context)) {
+                return false;
+            }
+            return ImsManager.isWfcProvisionedOnDevice(context);
+    }
+
+    /**
      * @return {@code true} if the device is configured to use "Wi-Fi only" mode. If WFC is not
      * enabled, this will return {@code false}.
      */
@@ -73,8 +88,8 @@
     /**
      * When a call cannot be placed, determines if the use of WFC should be promoted, per the
      * carrier config.  Use of WFC is promoted to the user if the device is connected to a WIFI
-     * network, WFC is disabled, and the carrier config indicates that the features should be
-     * promoted.
+     * network, WFC is disabled but provisioned, and the carrier config indicates that the
+     * features should be promoted.
      *
      * @return {@code true} if use of WFC should be promoted, {@code false} otherwise.
      */
@@ -86,6 +101,10 @@
             return false;
         }
 
+        if (!isWfcProvisioned(context)) {
+            return false;
+        }
+
         ConnectivityManager cm =
                 (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
         if (cm != null) {
diff --git a/src/com/android/services/telephony/TelephonyConnectionService.java b/src/com/android/services/telephony/TelephonyConnectionService.java
index b33769a..409d720 100644
--- a/src/com/android/services/telephony/TelephonyConnectionService.java
+++ b/src/com/android/services/telephony/TelephonyConnectionService.java
@@ -806,6 +806,8 @@
             int cause = android.telephony.DisconnectCause.OUTGOING_FAILURE;
             if (e.getError() == CallStateException.ERROR_DISCONNECTED) {
                 cause = android.telephony.DisconnectCause.OUT_OF_SERVICE;
+            } else if (e.getError() == CallStateException.ERROR_POWER_OFF) {
+                cause = android.telephony.DisconnectCause.POWER_OFF;
             }
             connection.setDisconnected(DisconnectCauseUtil.toTelecomDisconnectCause(
                     cause, e.getMessage()));