diff --git a/core/api/current.txt b/core/api/current.txt
index 17beece326df6..6a1a408e8eabe 100644
--- a/core/api/current.txt
+++ b/core/api/current.txt
@@ -41476,6 +41476,7 @@ package android.telephony {
     field public static final String KEY_EDITABLE_WFC_ROAMING_MODE_BOOL = "editable_wfc_roaming_mode_bool";
     field public static final String KEY_EMERGENCY_NOTIFICATION_DELAY_INT = "emergency_notification_delay_int";
     field public static final String KEY_EMERGENCY_NUMBER_PREFIX_STRING_ARRAY = "emergency_number_prefix_string_array";
+    field public static final String KEY_ENABLE_CROSS_SIM_CALLING_ON_OPPORTUNISTIC_DATA_BOOL = "enable_cross_sim_calling_on_opportunistic_data_bool";
     field public static final String KEY_ENABLE_DIALER_KEY_VIBRATION_BOOL = "enable_dialer_key_vibration_bool";
     field public static final String KEY_ENHANCED_4G_LTE_ON_BY_DEFAULT_BOOL = "enhanced_4g_lte_on_by_default_bool";
     field public static final String KEY_ENHANCED_4G_LTE_TITLE_VARIANT_INT = "enhanced_4g_lte_title_variant_int";
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 82113f29098a8..cd399c02a72eb 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -797,6 +797,14 @@ public class CarrierConfigManager {
     public static final String KEY_CARRIER_CROSS_SIM_IMS_AVAILABLE_BOOL =
             "carrier_cross_sim_ims_available_bool";
 
+    /**
+     * Flag specifying whether cross sim calling on opportunistic data is supported for carrier.
+     * When {@code false} the carrier does not support cross sim calling on opportunistic data.
+     * When {@code true} the carrier does support cross sim calling on opportunistic data.
+     */
+    public static final String KEY_ENABLE_CROSS_SIM_CALLING_ON_OPPORTUNISTIC_DATA_BOOL =
+            "enable_cross_sim_calling_on_opportunistic_data_bool";
+
     /**
      * Specifies a map from dialstrings to replacements for roaming network service numbers which
      * cannot be replaced on the carrier side.
@@ -5587,6 +5595,7 @@ public class CarrierConfigManager {
         sDefaults.putBoolean(KEY_VILTE_DATA_IS_METERED_BOOL, true);
         sDefaults.putBoolean(KEY_CARRIER_WFC_IMS_AVAILABLE_BOOL, false);
         sDefaults.putBoolean(KEY_CARRIER_CROSS_SIM_IMS_AVAILABLE_BOOL, false);
+        sDefaults.putBoolean(KEY_ENABLE_CROSS_SIM_CALLING_ON_OPPORTUNISTIC_DATA_BOOL, false);
         sDefaults.putBoolean(KEY_CARRIER_WFC_SUPPORTS_WIFI_ONLY_BOOL, false);
         sDefaults.putBoolean(KEY_CARRIER_DEFAULT_WFC_IMS_ENABLED_BOOL, false);
         sDefaults.putBoolean(KEY_CARRIER_DEFAULT_WFC_IMS_ROAMING_ENABLED_BOOL, false);