diff --git a/telephony/java/com/android/internal/telephony/cdma/CdmaSMSDispatcher.java b/telephony/java/com/android/internal/telephony/cdma/CdmaSMSDispatcher.java
index ecdc8f6..c4db609 100644
--- a/telephony/java/com/android/internal/telephony/cdma/CdmaSMSDispatcher.java
+++ b/telephony/java/com/android/internal/telephony/cdma/CdmaSMSDispatcher.java
@@ -25,12 +25,14 @@
 import android.database.SQLException;
 import android.os.AsyncResult;
 import android.os.Message;
+import android.os.SystemProperties;
 import android.provider.Telephony;
 import android.provider.Telephony.Sms.Intents;
 import android.preference.PreferenceManager;
 import android.util.Config;
 import android.util.Log;
 
+import com.android.internal.telephony.TelephonyProperties;
 import com.android.internal.telephony.CommandsInterface;
 import com.android.internal.telephony.SmsHeader;
 import com.android.internal.telephony.SmsMessageBase;
@@ -75,6 +77,11 @@
             return Intents.RESULT_SMS_GENERIC_ERROR;
         }
 
+        String inEcm=SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE, "false");
+        if (inEcm.equals("true")) {
+            return Intents.RESULT_SMS_GENERIC_ERROR;
+        }
+
         // Decode BD stream and set sms variables.
         SmsMessage sms = (SmsMessage) smsb;
         sms.parseSms();
@@ -343,6 +350,12 @@
     /** {@inheritDoc} */
     protected void acknowledgeLastIncomingSms(boolean success, int result, Message response){
         // FIXME unit test leaves cm == null. this should change
+
+        String inEcm=SystemProperties.get(TelephonyProperties.PROPERTY_INECM_MODE, "false");
+        if (inEcm.equals("true")) {
+            return;
+        }
+
         if (mCm != null) {
             mCm.acknowledgeLastIncomingCdmaSms(success, resultToCause(result), response);
         }