diff --git a/src/com/android/phone/CarrierConfigLoader.java b/src/com/android/phone/CarrierConfigLoader.java
index 76a16d3..2c31dfd 100644
--- a/src/com/android/phone/CarrierConfigLoader.java
+++ b/src/com/android/phone/CarrierConfigLoader.java
@@ -168,6 +168,7 @@
     private static final int EVENT_BIND_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT = 21;
     // Fetching config timed out from the default app for no SIM config.
     private static final int EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT = 22;
+    // NOTE: any new EVENT_* values must be added to method eventToString().
 
     private static final int BIND_TIMEOUT_MILLIS = 30000;
 
@@ -210,7 +211,7 @@
         @Override
         public void handleMessage(Message msg) {
             final int phoneId = msg.arg1;
-            logdWithLocalLog("mHandler: " + msg.what + " phoneId: " + phoneId);
+            logdWithLocalLog("mHandler: " + eventToString(msg.what) + " phoneId: " + phoneId);
             if (!SubscriptionManager.isValidPhoneId(phoneId)
                     && msg.what != EVENT_MULTI_SIM_CONFIG_CHANGED) {
                 return;
@@ -1653,6 +1654,56 @@
         }
     }
 
+    // Get readable string for the message code supported in this class.
+    private static String eventToString(int code) {
+        switch (code) {
+            case EVENT_CLEAR_CONFIG:
+                return "EVENT_CLEAR_CONFIG";
+            case EVENT_CONNECTED_TO_DEFAULT:
+                return "EVENT_CONNECTED_TO_DEFAULT";
+            case EVENT_CONNECTED_TO_CARRIER:
+                return "EVENT_CONNECTED_TO_CARRIER";
+            case EVENT_FETCH_DEFAULT_DONE:
+                return "EVENT_FETCH_DEFAULT_DONE";
+            case EVENT_FETCH_CARRIER_DONE:
+                return "EVENT_FETCH_CARRIER_DONE";
+            case EVENT_DO_FETCH_DEFAULT:
+                return "EVENT_DO_FETCH_DEFAULT";
+            case EVENT_DO_FETCH_CARRIER:
+                return "EVENT_DO_FETCH_CARRIER";
+            case EVENT_PACKAGE_CHANGED:
+                return "EVENT_PACKAGE_CHANGED";
+            case EVENT_BIND_DEFAULT_TIMEOUT:
+                return "EVENT_BIND_DEFAULT_TIMEOUT";
+            case EVENT_BIND_CARRIER_TIMEOUT:
+                return "EVENT_BIND_CARRIER_TIMEOUT";
+            case EVENT_CHECK_SYSTEM_UPDATE:
+                return "EVENT_CHECK_SYSTEM_UPDATE";
+            case EVENT_SYSTEM_UNLOCKED:
+                return "EVENT_SYSTEM_UNLOCKED";
+            case EVENT_FETCH_DEFAULT_TIMEOUT:
+                return "EVENT_FETCH_DEFAULT_TIMEOUT";
+            case EVENT_FETCH_CARRIER_TIMEOUT:
+                return "EVENT_FETCH_CARRIER_TIMEOUT";
+            case EVENT_SUBSCRIPTION_INFO_UPDATED:
+                return "EVENT_SUBSCRIPTION_INFO_UPDATED";
+            case EVENT_MULTI_SIM_CONFIG_CHANGED:
+                return "EVENT_MULTI_SIM_CONFIG_CHANGED";
+            case EVENT_DO_FETCH_DEFAULT_FOR_NO_SIM_CONFIG:
+                return "EVENT_DO_FETCH_DEFAULT_FOR_NO_SIM_CONFIG";
+            case EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_DONE:
+                return "EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_DONE";
+            case EVENT_CONNECTED_TO_DEFAULT_FOR_NO_SIM_CONFIG:
+                return "EVENT_CONNECTED_TO_DEFAULT_FOR_NO_SIM_CONFIG";
+            case EVENT_BIND_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT:
+                return "EVENT_BIND_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT";
+            case EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT:
+                return "EVENT_FETCH_DEFAULT_FOR_NO_SIM_CONFIG_TIMEOUT";
+            default:
+                return "UNKNOWN(" + code + ")";
+        }
+    }
+
     private void logd(String msg) {
         Log.d(LOG_TAG, msg);
     }