diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index a97c4b3..02492d1 100755
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -4359,7 +4359,7 @@
             synchronized (mLastModemActivityInfo) {
                 ModemActivityInfo info = (ModemActivityInfo) sendRequest(CMD_GET_MODEM_ACTIVITY_INFO,
                         null);
-                if (info != null) {
+                if (isModemActivityInfoValid(info)) {
                     int[] mergedTxTimeMs = new int[ModemActivityInfo.TX_POWER_LEVELS];
                     for (int i = 0; i < mergedTxTimeMs.length; i++) {
                         mergedTxTimeMs[i] =
@@ -4391,6 +4391,25 @@
         }
     }
 
+    // Checks that ModemActivityInfo is valid. Sleep time, Idle time, Rx time and Tx time should be
+    // less than total activity duration.
+    private boolean isModemActivityInfoValid(ModemActivityInfo info) {
+        if (info == null) {
+            return false;
+        }
+        int activityDurationMs =
+                (int) (info.getTimestamp() - mLastModemActivityInfo.getTimestamp());
+        int totalTxTimeMs = 0;
+        for (int i = 0; i < info.getTxTimeMillis().length; i++) {
+            totalTxTimeMs += info.getTxTimeMillis()[i];
+        }
+        return (info.isValid()
+            && (info.getSleepTimeMillis() <= activityDurationMs)
+            && (info.getIdleTimeMillis() <= activityDurationMs)
+            && (info.getRxTimeMillis() <= activityDurationMs)
+            && (totalTxTimeMs <= activityDurationMs));
+    }
+
     /**
      * {@hide}
      * Returns the service state information on specified subscription.