diff --git a/api/current.txt b/api/current.txt
index 2b662eb0676df..04e56f3e1f005 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -46802,6 +46802,7 @@ package android.telephony {
     field public static final String KEY_CARRIER_SETTINGS_ENABLE_BOOL = "carrier_settings_enable_bool";
     field public static final String KEY_CARRIER_SUPPORTS_SS_OVER_UT_BOOL = "carrier_supports_ss_over_ut_bool";
     field public static final String KEY_CARRIER_USE_IMS_FIRST_FOR_EMERGENCY_BOOL = "carrier_use_ims_first_for_emergency_bool";
+    field public static final String KEY_CARRIER_USSD_METHOD_INT = "carrier_ussd_method_int";
     field public static final String KEY_CARRIER_UT_PROVISIONING_REQUIRED_BOOL = "carrier_ut_provisioning_required_bool";
     field public static final String KEY_CARRIER_VOLTE_AVAILABLE_BOOL = "carrier_volte_available_bool";
     field public static final String KEY_CARRIER_VOLTE_OVERRIDE_WFC_PROVISIONING_BOOL = "carrier_volte_override_wfc_provisioning_bool";
@@ -46996,6 +46997,10 @@ package android.telephony {
     field public static final String KEY_WORLD_PHONE_BOOL = "world_phone_bool";
     field public static final int SERVICE_CLASS_NONE = 0; // 0x0
     field public static final int SERVICE_CLASS_VOICE = 1; // 0x1
+    field public static final int USSD_OVER_CS_ONLY = 2; // 0x2
+    field public static final int USSD_OVER_CS_PREFERRED = 0; // 0x0
+    field public static final int USSD_OVER_IMS_ONLY = 3; // 0x3
+    field public static final int USSD_OVER_IMS_PREFERRED = 1; // 0x1
   }
 
   public static final class CarrierConfigManager.Apn {
diff --git a/non-updatable-api/current.txt b/non-updatable-api/current.txt
index 480e49415da66..bcca63852eaf7 100644
--- a/non-updatable-api/current.txt
+++ b/non-updatable-api/current.txt
@@ -44945,6 +44945,7 @@ package android.telephony {
     field public static final String KEY_CARRIER_SETTINGS_ENABLE_BOOL = "carrier_settings_enable_bool";
     field public static final String KEY_CARRIER_SUPPORTS_SS_OVER_UT_BOOL = "carrier_supports_ss_over_ut_bool";
     field public static final String KEY_CARRIER_USE_IMS_FIRST_FOR_EMERGENCY_BOOL = "carrier_use_ims_first_for_emergency_bool";
+    field public static final String KEY_CARRIER_USSD_METHOD_INT = "carrier_ussd_method_int";
     field public static final String KEY_CARRIER_UT_PROVISIONING_REQUIRED_BOOL = "carrier_ut_provisioning_required_bool";
     field public static final String KEY_CARRIER_VOLTE_AVAILABLE_BOOL = "carrier_volte_available_bool";
     field public static final String KEY_CARRIER_VOLTE_OVERRIDE_WFC_PROVISIONING_BOOL = "carrier_volte_override_wfc_provisioning_bool";
@@ -45139,6 +45140,10 @@ package android.telephony {
     field public static final String KEY_WORLD_PHONE_BOOL = "world_phone_bool";
     field public static final int SERVICE_CLASS_NONE = 0; // 0x0
     field public static final int SERVICE_CLASS_VOICE = 1; // 0x1
+    field public static final int USSD_OVER_CS_ONLY = 2; // 0x2
+    field public static final int USSD_OVER_CS_PREFERRED = 0; // 0x0
+    field public static final int USSD_OVER_IMS_ONLY = 3; // 0x3
+    field public static final int USSD_OVER_IMS_PREFERRED = 1; // 0x1
   }
 
   public static final class CarrierConfigManager.Apn {
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 829c746c1b5f9..00d31898485c4 100755
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -79,6 +79,30 @@ public class CarrierConfigManager {
      */
     public static final int SERVICE_CLASS_VOICE = ImsSsData.SERVICE_CLASS_VOICE;
 
+    /**
+     * Only send USSD over IMS while CS is out of service, otherwise send USSD over CS.
+     * {@link #KEY_CARRIER_USSD_METHOD_INT}
+     */
+    public static final int USSD_OVER_CS_PREFERRED   = 0;
+
+    /**
+     * Send USSD over IMS or CS while IMS is out of service or silent redial over CS if needed.
+     * {@link #KEY_CARRIER_USSD_METHOD_INT}
+     */
+    public static final int USSD_OVER_IMS_PREFERRED  = 1;
+
+    /**
+     * Only send USSD over CS.
+     * {@link #KEY_CARRIER_USSD_METHOD_INT}
+     */
+    public static final int USSD_OVER_CS_ONLY        = 2;
+
+    /**
+     * Only send USSD over IMS and disallow silent redial over CS.
+     * {@link #KEY_CARRIER_USSD_METHOD_INT}
+     */
+    public static final int USSD_OVER_IMS_ONLY       = 3;
+
     private final Context mContext;
 
     /**
@@ -583,6 +607,20 @@ public class CarrierConfigManager {
      */
     public static final String KEY_CARRIER_VT_AVAILABLE_BOOL = "carrier_vt_available_bool";
 
+    /**
+     * Specify the method of selection for UE sending USSD requests. The default value is
+     * {@link #USSD_OVER_CS_PREFERRED}.
+     * <p> Available options:
+     * <ul>
+     *   <li>0: {@link #USSD_OVER_CS_PREFERRED} </li>
+     *   <li>1: {@link #USSD_OVER_IMS_PREFERRED} </li>
+     *   <li>2: {@link #USSD_OVER_CS_ONLY} </li>
+     *   <li>3: {@link #USSD_OVER_IMS_ONLY} </li>
+     * </ul>
+     */
+    public static final String KEY_CARRIER_USSD_METHOD_INT =
+            "carrier_ussd_method_int";
+
     /**
      * Flag specifying whether to show an alert dialog for 5G disable when the user disables VoLTE.
      * By default this value is {@code false}.
@@ -3953,6 +3991,7 @@ public class CarrierConfigManager {
         sDefaults.putBoolean(KEY_CARRIER_SETTINGS_ENABLE_BOOL, false);
         sDefaults.putBoolean(KEY_CARRIER_VOLTE_AVAILABLE_BOOL, false);
         sDefaults.putBoolean(KEY_CARRIER_VT_AVAILABLE_BOOL, false);
+        sDefaults.putInt(KEY_CARRIER_USSD_METHOD_INT, USSD_OVER_CS_PREFERRED);
         sDefaults.putBoolean(KEY_VOLTE_5G_LIMITED_ALERT_DIALOG_BOOL, false);
         sDefaults.putBoolean(KEY_NOTIFY_HANDOVER_VIDEO_FROM_WIFI_TO_LTE_BOOL, false);
         sDefaults.putBoolean(KEY_ALLOW_MERGING_RTT_CALLS_BOOL, false);