diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 7bb58dd4..632a1d6 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -1282,6 +1282,14 @@
         "support_3gpp_call_forwarding_while_roaming_bool";
 
     /**
+     * When {@code true}, the user will be notified when they attempt to place an international call
+     * when the call is placed using wifi calling.
+     * @hide
+     */
+    public static final String KEY_NOTIFY_INTERNATIONAL_CALL_ON_WFC_BOOL =
+            "notify_international_call_on_wfc_bool";
+
+    /**
      * Determine whether user edited tether APN (type dun) has effect
      * {@code false} - Default. APN with dun type in telephony database has no effect.
      *
@@ -1529,6 +1537,7 @@
         sDefaults.putStringArray(KEY_CARRIER_WIFI_STRING_ARRAY, null);
         sDefaults.putInt(KEY_PREF_NETWORK_NOTIFICATION_DELAY_INT, -1);
         sDefaults.putBoolean(KEY_SUPPORT_3GPP_CALL_FORWARDING_WHILE_ROAMING_BOOL, true);
+        sDefaults.putBoolean(KEY_NOTIFY_INTERNATIONAL_CALL_ON_WFC_BOOL, false);
         sDefaults.putBoolean(KEY_EDITABLE_TETHER_APN_BOOL, false);
         sDefaults.putStringArray(KEY_CALL_FORWARDING_BLOCKS_WHILE_ROAMING_STRING_ARRAY,
                 null);
diff --git a/telephony/java/android/telephony/PhoneNumberUtils.java b/telephony/java/android/telephony/PhoneNumberUtils.java
index cc21b5e..a3e11c8 100644
--- a/telephony/java/android/telephony/PhoneNumberUtils.java
+++ b/telephony/java/android/telephony/PhoneNumberUtils.java
@@ -1440,6 +1440,30 @@
     }
 
     /**
+     * Determines if a {@param phoneNumber} is international if dialed from
+     * {@param defaultCountryIso}.
+     *
+     * @param phoneNumber The phone number.
+     * @param defaultCountryIso The current country ISO.
+     * @return {@code true} if the number is international, {@code false} otherwise.
+     * @hide
+     */
+    public static boolean isInternationalNumber(String phoneNumber, String defaultCountryIso) {
+        // If it starts with # or * its not international.
+        if (phoneNumber.startsWith("#") || phoneNumber.startsWith("*")) {
+            return false;
+        }
+
+        PhoneNumberUtil util = PhoneNumberUtil.getInstance();
+        try {
+            PhoneNumber pn = util.parseAndKeepRawInput(phoneNumber, defaultCountryIso);
+            return pn.getCountryCode() != util.getCountryCodeForRegion(defaultCountryIso);
+        } catch (NumberParseException e) {
+            return false;
+        }
+    }
+
+    /**
      * Format a phone number.
      * <p>
      * If the given number doesn't have the country code, the phone will be
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index f5974cd..81e87b3 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -819,6 +819,21 @@
     public static final String EVENT_DOWNGRADE_DATA_DISABLED =
             "android.telephony.event.EVENT_DOWNGRADE_DATA_DISABLED";
 
+    /**
+     * {@link android.telecom.Connection} event used to indicate that the InCall UI should notify
+     * the user when an international call is placed while on WFC only.
+     * <p>
+     * Used when the carrier config value
+     * {@link CarrierConfigManager#KEY_NOTIFY_INTERNATIONAL_CALL_ON_WFC_BOOL} is true, the device
+     * is on WFC (VoLTE not available) and an international number is dialed.
+     * <p>
+     * Sent via {@link android.telecom.Connection#sendConnectionEvent(String, Bundle)}.
+     * The {@link Bundle} parameter is expected to be null when this connection event is used.
+     * @hide
+     */
+    public static final String EVENT_NOTIFY_INTERNATIONAL_CALL_ON_WFC =
+            "android.telephony.event.EVENT_NOTIFY_INTERNATIONAL_CALL_ON_WFC";
+
     /* Visual voicemail protocols */
 
     /**