diff --git a/api/current.txt b/api/current.txt
index 72351443ea1e4..3efbb2df38b73 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -37410,6 +37410,7 @@ package android.telephony {
     field public static final java.lang.String KEY_SHOW_ONSCREEN_DIAL_BUTTON_BOOL = "show_onscreen_dial_button_bool";
     field public static final java.lang.String KEY_SIMPLIFIED_NETWORK_SETTINGS_BOOL = "simplified_network_settings_bool";
     field public static final java.lang.String KEY_SIM_NETWORK_UNLOCK_ALLOW_DISMISS_BOOL = "sim_network_unlock_allow_dismiss_bool";
+    field public static final java.lang.String KEY_SUPPORT_3GPP_CALL_FORWARDING_WHILE_ROAMING_BOOL = "support_3gpp_call_forwarding_while_roaming_bool";
     field public static final java.lang.String KEY_SUPPORT_CONFERENCE_CALL_BOOL = "support_conference_call_bool";
     field public static final java.lang.String KEY_SUPPORT_PAUSE_IMS_VIDEO_CALLS_BOOL = "support_pause_ims_video_calls_bool";
     field public static final java.lang.String KEY_SUPPORT_SWAP_AFTER_MERGE_BOOL = "support_swap_after_merge_bool";
diff --git a/api/system-current.txt b/api/system-current.txt
index e1a45685b0868..2407c7adb6136 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -40580,6 +40580,7 @@ package android.telephony {
     field public static final java.lang.String KEY_SHOW_ONSCREEN_DIAL_BUTTON_BOOL = "show_onscreen_dial_button_bool";
     field public static final java.lang.String KEY_SIMPLIFIED_NETWORK_SETTINGS_BOOL = "simplified_network_settings_bool";
     field public static final java.lang.String KEY_SIM_NETWORK_UNLOCK_ALLOW_DISMISS_BOOL = "sim_network_unlock_allow_dismiss_bool";
+    field public static final java.lang.String KEY_SUPPORT_3GPP_CALL_FORWARDING_WHILE_ROAMING_BOOL = "support_3gpp_call_forwarding_while_roaming_bool";
     field public static final java.lang.String KEY_SUPPORT_CONFERENCE_CALL_BOOL = "support_conference_call_bool";
     field public static final java.lang.String KEY_SUPPORT_PAUSE_IMS_VIDEO_CALLS_BOOL = "support_pause_ims_video_calls_bool";
     field public static final java.lang.String KEY_SUPPORT_SWAP_AFTER_MERGE_BOOL = "support_swap_after_merge_bool";
diff --git a/api/test-current.txt b/api/test-current.txt
index a9af7f3b2ab0c..cdbf5ba550e41 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -37492,6 +37492,7 @@ package android.telephony {
     field public static final java.lang.String KEY_SHOW_ONSCREEN_DIAL_BUTTON_BOOL = "show_onscreen_dial_button_bool";
     field public static final java.lang.String KEY_SIMPLIFIED_NETWORK_SETTINGS_BOOL = "simplified_network_settings_bool";
     field public static final java.lang.String KEY_SIM_NETWORK_UNLOCK_ALLOW_DISMISS_BOOL = "sim_network_unlock_allow_dismiss_bool";
+    field public static final java.lang.String KEY_SUPPORT_3GPP_CALL_FORWARDING_WHILE_ROAMING_BOOL = "support_3gpp_call_forwarding_while_roaming_bool";
     field public static final java.lang.String KEY_SUPPORT_CONFERENCE_CALL_BOOL = "support_conference_call_bool";
     field public static final java.lang.String KEY_SUPPORT_PAUSE_IMS_VIDEO_CALLS_BOOL = "support_pause_ims_video_calls_bool";
     field public static final java.lang.String KEY_SUPPORT_SWAP_AFTER_MERGE_BOOL = "support_swap_after_merge_bool";
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index 426d2ebecab0a..42316980aa2d4 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -101,6 +101,8 @@
     <!-- Displayed when the user dialed an MMI code whose function
          could not be performed because FDN is enabled. This will be displayed in a toast. -->
     <string name="mmiFdnError">Operation is restricted to fixed dialing numbers only.</string>
+    <!-- Displayed when a carrier does not support call forwarding queries when roaming. -->
+    <string name="mmiErrorWhileRoaming">Can not change call forwarding settings from your phone while you are roaming.</string>
 
     <!-- Displayed when a phone feature such as call barring was activated. -->
     <string name="serviceEnabled">Service was enabled.</string>
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index bdac134f20cb7..66087d6970483 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -725,6 +725,7 @@
   <java-symbol type="string" name="mmiComplete" />
   <java-symbol type="string" name="mmiError" />
   <java-symbol type="string" name="mmiFdnError" />
+  <java-symbol type="string" name="mmiErrorWhileRoaming" />
   <java-symbol type="string" name="month_day_year" />
   <java-symbol type="string" name="more_item_label" />
   <java-symbol type="string" name="needPuk" />
diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 04c10d28cb36e..98029165e64f8 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -1119,6 +1119,14 @@ public class CarrierConfigManager {
     public static final String KEY_EDITABLE_WFC_ROAMING_MODE_BOOL =
             "editable_wfc_roaming_mode_bool";
 
+    /**
+     * Indicates whether the carrier supports 3gpp call forwarding MMI codes while roaming. If
+     * false, the user will be notified that call forwarding is not available when the MMI code
+     * fails.
+     */
+    public static final String KEY_SUPPORT_3GPP_CALL_FORWARDING_WHILE_ROAMING_BOOL =
+            "support_3gpp_call_forwarding_while_roaming_bool";
+
     /** The default value for every variable. */
     private final static PersistableBundle sDefaults;
 
@@ -1323,6 +1331,7 @@ public class CarrierConfigManager {
         sDefaults.putBoolean(KEY_NOTIFY_VT_HANDOVER_TO_WIFI_FAILURE_BOOL, false);
         sDefaults.putStringArray(KEY_FILTERED_CNAP_NAMES_STRING_ARRAY, null);
         sDefaults.putBoolean(KEY_EDITABLE_WFC_ROAMING_MODE_BOOL, false);
+        sDefaults.putBoolean(KEY_SUPPORT_3GPP_CALL_FORWARDING_WHILE_ROAMING_BOOL, true);
     }
 
     /**