diff --git a/radio/aidl/android/hardware/radio/network/IRadioNetworkResponse.aidl b/radio/aidl/android/hardware/radio/network/IRadioNetworkResponse.aidl
index d9eea03..b67e8e0 100644
--- a/radio/aidl/android/hardware/radio/network/IRadioNetworkResponse.aidl
+++ b/radio/aidl/android/hardware/radio/network/IRadioNetworkResponse.aidl
@@ -747,6 +747,7 @@
 
     /**
      * Response of isCellularIdentifierTransparencyEnabled.
+     * This is an optional API.
      *
      * @param info Response info struct containing response type, serial no. and error.
      * @param isEnabled Indicates whether cellular identifier transparency is enabled or not.
@@ -757,12 +758,14 @@
      *   RadioError:NONE
      *   RadioError:RADIO_NOT_AVAILABLE
      *   RadioError:INTERNAL_ERR
+     *   RadioError:REQUEST_NOT_SUPPORTED
      */
     void isCellularIdentifierTransparencyEnabledResponse(
             in RadioResponseInfo info, boolean isEnabled);
 
     /**
      * Response of setCellularIdentifierTransparencyEnabled.
+     * This is an optional API.
      *
      * @param info Response info struct containing response type, serial no. and error.
      *
@@ -773,11 +776,13 @@
      *   RadioError:RADIO_NOT_AVAILABLE
      *   RadioError:INTERNAL_ERR
      *   RadioError:INVALID_STATE
+     *   RadioError:REQUEST_NOT_SUPPORTED
      */
     void setCellularIdentifierTransparencyEnabledResponse(in RadioResponseInfo info);
 
     /**
      * Response of setSecurityAlgorithmsUpdatedEnabled.
+     * This is an optional API.
      *
      * @param info Response info struct containing response type, serial no. and error.
      *
@@ -788,11 +793,13 @@
      *   RadioError:RADIO_NOT_AVAILABLE
      *   RadioError:INTERNAL_ERR
      *   RadioError:INVALID_STATE
+     *   RadioError:REQUEST_NOT_SUPPORTED
      */
     void setSecurityAlgorithmsUpdatedEnabledResponse(in RadioResponseInfo info);
 
     /**
      * Response of isSecurityAlgorithmsUpdatedEnabled.
+     * This is an optional API.
      *
      * @param info Response info struct containing response type, serial no. and error.
      * @param isEnabled Indicates whether cellular ciphering transparency is enabled or not.
@@ -803,6 +810,7 @@
      *   RadioError:NONE
      *   RadioError:RADIO_NOT_AVAILABLE
      *   RadioError:INTERNAL_ERR
+     *   RadioError:REQUEST_NOT_SUPPORTED
      */
     void isSecurityAlgorithmsUpdatedEnabledResponse(
             in RadioResponseInfo info, in boolean isEnabled);
diff --git a/radio/aidl/vts/radio_network_test.cpp b/radio/aidl/vts/radio_network_test.cpp
index afd0c73..49c1e7c 100644
--- a/radio/aidl/vts/radio_network_test.cpp
+++ b/radio/aidl/vts/radio_network_test.cpp
@@ -2471,9 +2471,9 @@
     EXPECT_EQ(RadioResponseType::SOLICITED, radioRsp_network->rspInfo.type);
     EXPECT_EQ(serial, radioRsp_network->rspInfo.serial);
 
-    ASSERT_TRUE(CheckAnyOfErrors(
-            radioRsp_network->rspInfo.error,
-            {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE, RadioError::MODEM_ERR}));
+    ASSERT_TRUE(CheckAnyOfErrors(radioRsp_network->rspInfo.error,
+                                 {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE,
+                                  RadioError::MODEM_ERR, RadioError::REQUEST_NOT_SUPPORTED}));
 }
 
 TEST_P(RadioNetworkTest, setCellularIdentifierTransparencyEnabled) {
@@ -2502,9 +2502,9 @@
     EXPECT_EQ(RadioResponseType::SOLICITED, radioRsp_network->rspInfo.type);
     EXPECT_EQ(serial, radioRsp_network->rspInfo.serial);
 
-    ASSERT_TRUE(CheckAnyOfErrors(
-            radioRsp_network->rspInfo.error,
-            {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE, RadioError::MODEM_ERR}));
+    ASSERT_TRUE(CheckAnyOfErrors(radioRsp_network->rspInfo.error,
+                                 {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE,
+                                  RadioError::MODEM_ERR, RadioError::REQUEST_NOT_SUPPORTED}));
 
     // Assert the value has changed
     serial = GetRandomSerialNumber();
@@ -2514,9 +2514,9 @@
     EXPECT_EQ(std::cv_status::no_timeout, wait());
     EXPECT_EQ(RadioResponseType::SOLICITED, radioRsp_network->rspInfo.type);
     EXPECT_EQ(serial, radioRsp_network->rspInfo.serial);
-    ASSERT_TRUE(CheckAnyOfErrors(
-            radioRsp_network->rspInfo.error,
-            {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE, RadioError::MODEM_ERR}));
+    ASSERT_TRUE(CheckAnyOfErrors(radioRsp_network->rspInfo.error,
+                                 {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE,
+                                  RadioError::MODEM_ERR, RadioError::REQUEST_NOT_SUPPORTED}));
     EXPECT_EQ(valueToSet, radioRsp_network->isCellularIdentifierTransparencyEnabled);
 
     // Reset original state
@@ -2555,9 +2555,9 @@
     EXPECT_EQ(RadioResponseType::SOLICITED, radioRsp_network->rspInfo.type);
     EXPECT_EQ(serial, radioRsp_network->rspInfo.serial);
 
-    ASSERT_TRUE(CheckAnyOfErrors(
-            radioRsp_network->rspInfo.error,
-            {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE, RadioError::MODEM_ERR}));
+    ASSERT_TRUE(CheckAnyOfErrors(radioRsp_network->rspInfo.error,
+                                 {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE,
+                                  RadioError::MODEM_ERR, RadioError::REQUEST_NOT_SUPPORTED}));
 
     // Assert the value has changed
     serial = GetRandomSerialNumber();
@@ -2567,9 +2567,9 @@
     EXPECT_EQ(std::cv_status::no_timeout, wait());
     EXPECT_EQ(RadioResponseType::SOLICITED, radioRsp_network->rspInfo.type);
     EXPECT_EQ(serial, radioRsp_network->rspInfo.serial);
-    ASSERT_TRUE(CheckAnyOfErrors(
-            radioRsp_network->rspInfo.error,
-            {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE, RadioError::MODEM_ERR}));
+    ASSERT_TRUE(CheckAnyOfErrors(radioRsp_network->rspInfo.error,
+                                 {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE,
+                                  RadioError::MODEM_ERR, RadioError::REQUEST_NOT_SUPPORTED}));
     EXPECT_EQ(valueToSet, radioRsp_network->isSecurityAlgorithmsUpdatedEnabled);
 
     // Reset original state
@@ -2601,7 +2601,7 @@
     EXPECT_EQ(RadioResponseType::SOLICITED, radioRsp_network->rspInfo.type);
     EXPECT_EQ(serial, radioRsp_network->rspInfo.serial);
 
-    ASSERT_TRUE(CheckAnyOfErrors(
-            radioRsp_network->rspInfo.error,
-            {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE, RadioError::MODEM_ERR}));
+    ASSERT_TRUE(CheckAnyOfErrors(radioRsp_network->rspInfo.error,
+                                 {RadioError::NONE, RadioError::RADIO_NOT_AVAILABLE,
+                                  RadioError::MODEM_ERR, RadioError::REQUEST_NOT_SUPPORTED}));
 }