diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 7592162..0b92395 100644
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -12698,6 +12698,32 @@
     }
 
     /**
+     * This API can be used by only CTS to override the cached value for the device overlay config
+     * value : config_send_satellite_datagram_to_modem_in_demo_mode, which determines whether
+     * outgoing satellite datagrams should be sent to modem in demo mode.
+     *
+     * @param shouldSendToModemInDemoMode Whether send datagram in demo mode should be sent to
+     * satellite modem or not.
+     *
+     * @return {@code true} if the operation is successful, {@code false} otherwise.
+     */
+    public boolean setShouldSendDatagramToModemInDemoMode(boolean shouldSendToModemInDemoMode) {
+        if (!mFeatureFlags.oemEnabledSatelliteFlag()) {
+            Log.d(LOG_TAG, "shouldSendDatagramToModemInDemoMode: oemEnabledSatelliteFlag is "
+                    + "disabled");
+            return false;
+        }
+        Log.d(LOG_TAG, "setShouldSendDatagramToModemInDemoMode");
+        TelephonyPermissions.enforceShellOnly(
+                Binder.getCallingUid(), "setShouldSendDatagramToModemInDemoMode");
+        TelephonyPermissions.enforceCallingOrSelfModifyPermissionOrCarrierPrivilege(mApp,
+                SubscriptionManager.INVALID_SUBSCRIPTION_ID,
+                "setShouldSendDatagramToModemInDemoMode");
+        return mSatelliteController.setShouldSendDatagramToModemInDemoMode(
+                shouldSendToModemInDemoMode);
+    }
+
+    /**
      * Check whether the caller (or self, if not processing an IPC) can read device identifiers.
      *
      * <p>This method behaves in one of the following ways:
diff --git a/src/com/android/phone/TelephonyShellCommand.java b/src/com/android/phone/TelephonyShellCommand.java
index d6ecc48..5986a7c 100644
--- a/src/com/android/phone/TelephonyShellCommand.java
+++ b/src/com/android/phone/TelephonyShellCommand.java
@@ -191,6 +191,8 @@
             "set-satellite-device-aligned-timeout-duration";
     private static final String SET_EMERGENCY_CALL_TO_SATELLITE_HANDOVER_TYPE =
             "set-emergency-call-to-satellite-handover-type";
+    private static final String SET_SHOULD_SEND_DATAGRAM_TO_MODEM_IN_DEMO_MODE =
+            "set-should-send-datagram-to-modem-in-demo-mode";
 
     private static final String INVALID_ENTRY_ERROR = "An emergency number (only allow '0'-'9', "
             + "'*', '#' or '+') needs to be specified after -a in the command ";
@@ -384,6 +386,8 @@
                 return handleSettSatelliteDeviceAlignedTimeoutDuration();
             case SET_EMERGENCY_CALL_TO_SATELLITE_HANDOVER_TYPE:
                 return handleSetEmergencyCallToSatelliteHandoverType();
+            case SET_SHOULD_SEND_DATAGRAM_TO_MODEM_IN_DEMO_MODE:
+                return handleSetShouldSendDatagramToModemInDemoMode();
             default: {
                 return handleDefaultCommands(cmd);
             }
@@ -3342,6 +3346,54 @@
         return 0;
     }
 
+    private int handleSetShouldSendDatagramToModemInDemoMode() {
+        PrintWriter errPw = getErrPrintWriter();
+        String opt;
+        boolean shouldSendToDemoMode;
+
+        if ((opt = getNextArg()) == null) {
+            errPw.println(
+                    "adb shell cmd phone set-should-send-datagram-to-modem-in-demo-mode :"
+                            + " Invalid Argument");
+            return -1;
+        } else {
+            switch (opt) {
+                case "true": {
+                    shouldSendToDemoMode = true;
+                    break;
+                }
+                case "false": {
+                    shouldSendToDemoMode = false;
+                    break;
+                }
+                default:
+                    errPw.println(
+                            "adb shell cmd phone set-should-send-datagram-to-modem-in-demo-mode :"
+                                    + " Invalid Argument");
+                    return -1;
+            }
+        }
+
+        Log.d(LOG_TAG,
+                "handleSetShouldSendDatagramToModemInDemoMode(" + shouldSendToDemoMode + ")");
+
+        try {
+            boolean result = mInterface.setShouldSendDatagramToModemInDemoMode(
+                    shouldSendToDemoMode);
+            if (VDBG) {
+                Log.v(LOG_TAG, "handleSetShouldSendDatagramToModemInDemoMode returns: "
+                        + result);
+            }
+            getOutPrintWriter().println(false);
+        } catch (RemoteException e) {
+            Log.w(LOG_TAG, "setShouldSendDatagramToModemInDemoMode(" + shouldSendToDemoMode
+                    + "), error = " + e.getMessage());
+            errPw.println("Exception: " + e.getMessage());
+            return -1;
+        }
+        return 0;
+    }
+
     private int handleCarrierRestrictionStatusCommand() {
         try {
             String MOCK_MODEM_SERVICE_NAME = "android.telephony.mockmodem.MockModemService";