diff --git a/api/current.txt b/api/current.txt
index 6126e90babd94..47cfe3cb3e80d 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -45183,6 +45183,7 @@ package android.telephony {
     method public void updateAvailableNetworks(@NonNull java.util.List<android.telephony.AvailableNetworkInfo>, @Nullable java.util.concurrent.Executor, @Nullable java.util.function.Consumer<java.lang.Integer>);
     field public static final String ACTION_CARRIER_MESSAGING_CLIENT_SERVICE = "android.telephony.action.CARRIER_MESSAGING_CLIENT_SERVICE";
     field public static final String ACTION_CONFIGURE_VOICEMAIL = "android.telephony.action.CONFIGURE_VOICEMAIL";
+    field public static final String ACTION_MULTI_SIM_CONFIG_CHANGED = "android.telephony.action.MULTI_SIM_CONFIG_CHANGED";
     field public static final String ACTION_NETWORK_COUNTRY_CHANGED = "android.telephony.action.NETWORK_COUNTRY_CHANGED";
     field @RequiresPermission(android.Manifest.permission.READ_PHONE_STATE) public static final String ACTION_PHONE_STATE_CHANGED = "android.intent.action.PHONE_STATE";
     field public static final String ACTION_RESPOND_VIA_MESSAGE = "android.intent.action.RESPOND_VIA_MESSAGE";
@@ -45223,6 +45224,7 @@ package android.telephony {
     field public static final String EXTRA_LAUNCH_VOICEMAIL_SETTINGS_INTENT = "android.telephony.extra.LAUNCH_VOICEMAIL_SETTINGS_INTENT";
     field public static final String EXTRA_NETWORK_COUNTRY = "android.telephony.extra.NETWORK_COUNTRY";
     field public static final String EXTRA_NOTIFICATION_COUNT = "android.telephony.extra.NOTIFICATION_COUNT";
+    field public static final String EXTRA_NUM_OF_ACTIVE_SIM_SUPPORTED = "android.telephony.extra.NUM_OF_ACTIVE_SIM_SUPPORTED";
     field public static final String EXTRA_PHONE_ACCOUNT_HANDLE = "android.telephony.extra.PHONE_ACCOUNT_HANDLE";
     field public static final String EXTRA_SPECIFIC_CARRIER_ID = "android.telephony.extra.SPECIFIC_CARRIER_ID";
     field public static final String EXTRA_SPECIFIC_CARRIER_NAME = "android.telephony.extra.SPECIFIC_CARRIER_NAME";
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index cfc2ed4361d73..b584e9d23773f 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -1170,6 +1170,35 @@ public class TelephonyManager {
     public static final String EXTRA_VOICEMAIL_SCRAMBLED_PIN_STRING =
             "android.telephony.extra.VOICEMAIL_SCRAMBLED_PIN_STRING";
 
+    /**
+     * Broadcast intent that indicates multi-SIM configuration is changed. For example, it changed
+     * from single SIM capable to dual-SIM capable (DSDS or DSDA) or triple-SIM mode.
+     *
+     * It doesn't indicate how many subscriptions are actually active, or which states SIMs are,
+     * or that all steps during multi-SIM change are done. To know those information you still need
+     * to listen to SIM_STATE changes or active subscription changes.
+     *
+     * See extra of {@link #EXTRA_NUM_OF_ACTIVE_SIM_SUPPORTED} for updated value.
+     */
+    public static final String ACTION_MULTI_SIM_CONFIG_CHANGED =
+            "android.telephony.action.MULTI_SIM_CONFIG_CHANGED";
+
+
+    /**
+     * The number of active SIM supported by current multi-SIM config. It's not related to how many
+     * SIM/subscriptions are currently active.
+     *
+     * For single SIM mode, it's 1.
+     * For DSDS or DSDA mode, it's 2.
+     * For triple-SIM mode, it's 3.
+     *
+     * Extra of {@link #ACTION_MULTI_SIM_CONFIG_CHANGED}.
+     *
+     * type: integer
+     */
+    public static final String EXTRA_NUM_OF_ACTIVE_SIM_SUPPORTED =
+            "android.telephony.extra.NUM_OF_ACTIVE_SIM_SUPPORTED";
+
     /**
      * @hide
      */