diff --git a/api/current.txt b/api/current.txt
index e9952629f5e92..5650cce1d2b3f 100644
--- a/api/current.txt
+++ b/api/current.txt
@@ -37477,6 +37477,7 @@ 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_SIM_NETWORK_UNLOCK_ALLOW_DISMISS_BOOL = "sim_network_unlock_allow_dismiss_bool";
     field public static final java.lang.String KEY_SMS_REQUIRES_DESTINATION_NUMBER_CONVERSION_BOOL = "sms_requires_destination_number_conversion_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 6cbe2d0e1d6fb..445e57cfa2e28 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -40537,6 +40537,7 @@ 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_SIM_NETWORK_UNLOCK_ALLOW_DISMISS_BOOL = "sim_network_unlock_allow_dismiss_bool";
     field public static final java.lang.String KEY_SMS_REQUIRES_DESTINATION_NUMBER_CONVERSION_BOOL = "sms_requires_destination_number_conversion_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 c98f49ca8ffce..148ce1cbc91bb 100644
--- a/api/test-current.txt
+++ b/api/test-current.txt
@@ -37574,6 +37574,7 @@ 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_SIM_NETWORK_UNLOCK_ALLOW_DISMISS_BOOL = "sim_network_unlock_allow_dismiss_bool";
     field public static final java.lang.String KEY_SMS_REQUIRES_DESTINATION_NUMBER_CONVERSION_BOOL = "sms_requires_destination_number_conversion_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 10badabc4cbe9..3423f0a11d67f 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -103,6 +103,8 @@
     <!-- 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 dcb44d32bd15a..c452c6208ace0 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -733,6 +733,7 @@
   <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 5e28734e75d2f..939a3b8838b64 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -1146,6 +1146,14 @@ public class CarrierConfigManager {
     public static final String KEY_PREF_NETWORK_NOTIFICATION_DELAY_INT =
             "network_notification_delay_int";
 
+    /**
+     * 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;
 
@@ -1349,6 +1357,7 @@ public class CarrierConfigManager {
         sDefaults.putBoolean(KEY_PERSIST_LPP_MODE_BOOL, false);
         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);
     }
 
     /**