diff --git a/api/system-current.txt b/api/system-current.txt
index 3a988314cc715..9375eb4c2cff8 100755
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -9684,6 +9684,7 @@ package android.telephony {
     method @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public boolean isAnyRadioPoweredOn();
     method @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public boolean isApplicationOnUicc(int);
     method public boolean isCurrentSimOperator(@NonNull String, int, @Nullable String);
+    method @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public boolean isDataAllowedInVoiceCall();
     method @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public boolean isDataConnectionEnabled();
     method public boolean isDataConnectivityPossible();
     method @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE) public boolean isDataEnabledForApn(int);
@@ -9722,6 +9723,7 @@ package android.telephony {
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setCarrierDataEnabled(boolean);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public int setCarrierRestrictionRules(@NonNull android.telephony.CarrierRestrictionRules);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setDataActivationState(int);
+    method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public boolean setDataAllowedDuringVoiceCall(boolean);
     method @Deprecated @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setDataEnabled(int, boolean);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setDataRoamingEnabled(boolean);
     method @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE) public void setMultiSimCarrierRestriction(boolean);
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index 949225146e6fe..400b6560d285e 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -12408,6 +12408,7 @@ public class TelephonyManager {
     }
 
     /**
+<<<<<<< HEAD
      * Gets the voice call forwarding info {@link CallForwardingInfo}, given the call forward
      * reason.
      *
@@ -12593,15 +12594,21 @@ public class TelephonyManager {
     }
 
     /**
-     * Set allowing mobile data during voice call.
+     * Set allowing mobile data during voice call. This is used for allowing data on the non-default
+     * data SIM. When a voice call is placed on the non-default data SIM on DSDS devices, users will
+     * not be able to use mobile data. By calling this API, data will be temporarily enabled on the
+     * non-default data SIM during the life cycle of the voice call.
      *
      * @param allow {@code true} if allowing using data during voice call, {@code false} if
-     * disallowed
+     * disallowed.
      *
-     * @return {@code false} if the setting is changed.
+     * @return {@code true} if operation is successful. otherwise {@code false}.
+     *
+     * @throws SecurityException if the caller doesn't have the permission.
      *
      * @hide
      */
+    @SystemApi
     @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
     public boolean setDataAllowedDuringVoiceCall(boolean allow) {
         try {
@@ -12610,6 +12617,7 @@ public class TelephonyManager {
                 return service.setDataAllowedDuringVoiceCall(getSubId(), allow);
             }
         } catch (RemoteException ex) {
+            // This could happen if binder process crashes.
             if (!isSystemProcess()) {
                 ex.rethrowAsRuntimeException();
             }
@@ -12618,13 +12626,18 @@ public class TelephonyManager {
     }
 
     /**
-     * Check whether data is allowed during voice call. Note this is for dual sim device that
-     * data might be disabled on non-default data subscription but explicitly turned on by settings.
+     * Check whether data is allowed during voice call. This is used for allowing data on the
+     * non-default data SIM. When a voice call is placed on the non-default data SIM on DSDS
+     * devices, users will not be able to use mobile data. By calling this API, data will be
+     * temporarily enabled on the non-default data SIM during the life cycle of the voice call.
      *
      * @return {@code true} if data is allowed during voice call.
      *
+     * @throws SecurityException if the caller doesn't have the permission.
+     *
      * @hide
      */
+    @SystemApi
     @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE)
     public boolean isDataAllowedInVoiceCall() {
         try {
@@ -12633,6 +12646,7 @@ public class TelephonyManager {
                 return service.isDataAllowedInVoiceCall(getSubId());
             }
         } catch (RemoteException ex) {
+            // This could happen if binder process crashes.
             if (!isSystemProcess()) {
                 ex.rethrowAsRuntimeException();
             }