diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index d2cfa29..69c2b8a 100755
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -368,6 +368,7 @@
     private static final int MANUFACTURER_CODE_LENGTH = 8;
 
     private static final int SET_DATA_THROTTLING_MODEM_THREW_INVALID_PARAMS = -1;
+    private static final int MODEM_DOES_NOT_SUPPORT_DATA_THROTTLING_ERROR_CODE = -2;
 
     /**
      * Experiment flag to enable erase modem config on reset network, default value is false
@@ -1775,6 +1776,8 @@
                                 .THERMAL_MITIGATION_RESULT_MODEM_NOT_AVAILABLE;
                         } else if (error == CommandException.Error.INVALID_ARGUMENTS) {
                             request.result = SET_DATA_THROTTLING_MODEM_THREW_INVALID_PARAMS;
+                        } else if (error == CommandException.Error.REQUEST_NOT_SUPPORTED) {
+                            request.result = MODEM_DOES_NOT_SUPPORT_DATA_THROTTLING_ERROR_CODE;
                         } else {
                             request.result =
                                     TelephonyManager.THERMAL_MITIGATION_RESULT_MODEM_ERROR;
@@ -9371,6 +9374,13 @@
 
     private int handleDataThrottlingRequest(int subId,
             DataThrottlingRequest dataThrottlingRequest) {
+        boolean isDataThrottlingSupported = isRadioInterfaceCapabilitySupported(
+                TelephonyManager.CAPABILITY_THERMAL_MITIGATION_DATA_THROTTLING);
+        if (!isDataThrottlingSupported && dataThrottlingRequest.getDataThrottlingAction()
+                != DataThrottlingRequest.DATA_THROTTLING_ACTION_NO_DATA_THROTTLING) {
+            throw new IllegalArgumentException("modem does not support data throttling");
+        }
+
         // Ensure that radio is on. If not able to power on due to phone being unavailable, return
         // THERMAL_MITIGATION_RESULT_MODEM_NOT_AVAILABLE.
         if (!setRadioPowerForThermal(subId, true)) {
@@ -9379,12 +9389,19 @@
 
         setDataEnabledForReason(subId, TelephonyManager.DATA_ENABLED_REASON_THERMAL, true);
 
-        int thermalMitigationResult =
+        if (isDataThrottlingSupported) {
+            int thermalMitigationResult =
                 (int) sendRequest(CMD_SET_DATA_THROTTLING, dataThrottlingRequest, subId);
-        if (thermalMitigationResult == SET_DATA_THROTTLING_MODEM_THREW_INVALID_PARAMS) {
-            throw new IllegalArgumentException("modem returned INVALID_ARGUMENTS");
+            if (thermalMitigationResult == SET_DATA_THROTTLING_MODEM_THREW_INVALID_PARAMS) {
+                throw new IllegalArgumentException("modem returned INVALID_ARGUMENTS");
+            } else if (thermalMitigationResult
+                    == MODEM_DOES_NOT_SUPPORT_DATA_THROTTLING_ERROR_CODE) {
+                throw new IllegalArgumentException("modem does not support data throttling");
+            }
+            return thermalMitigationResult;
         }
-        return thermalMitigationResult;
+
+        return TelephonyManager.THERMAL_MITIGATION_RESULT_SUCCESS;
     }
 
     /**