diff --git a/services/core/java/com/android/server/net/NetworkStatsService.java b/services/core/java/com/android/server/net/NetworkStatsService.java
index b5aa4d83fd..150ad34669 100644
--- a/services/core/java/com/android/server/net/NetworkStatsService.java
+++ b/services/core/java/com/android/server/net/NetworkStatsService.java
@@ -45,7 +45,6 @@ import static android.provider.Settings.Global.NETSTATS_DEV_PERSIST_BYTES;
 import static android.provider.Settings.Global.NETSTATS_DEV_ROTATE_AGE;
 import static android.provider.Settings.Global.NETSTATS_GLOBAL_ALERT_BYTES;
 import static android.provider.Settings.Global.NETSTATS_POLL_INTERVAL;
-import static android.provider.Settings.Global.NETSTATS_REPORT_XT_OVER_DEV;
 import static android.provider.Settings.Global.NETSTATS_SAMPLE_ENABLED;
 import static android.provider.Settings.Global.NETSTATS_TIME_CACHE_MAX_AGE;
 import static android.provider.Settings.Global.NETSTATS_UID_BUCKET_DURATION;
@@ -184,7 +183,6 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
         public long getPollInterval();
         public long getTimeCacheMaxAge();
         public boolean getSampleEnabled();
-        public boolean getReportXtOverDev();
 
         public static class Config {
             public final long bucketDuration;
@@ -229,8 +227,6 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
     private NetworkStatsRecorder mUidRecorder;
     private NetworkStatsRecorder mUidTagRecorder;
 
-    /** Cached {@link #mDevRecorder} stats. */
-    private NetworkStatsCollection mDevStatsCached;
     /** Cached {@link #mXtRecorder} stats. */
     private NetworkStatsCollection mXtStatsCached;
 
@@ -305,7 +301,6 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
 
             // read historical network stats from disk, since policy service
             // might need them right away.
-            mDevStatsCached = mDevRecorder.getOrLoadCompleteLocked();
             mXtStatsCached = mXtRecorder.getOrLoadCompleteLocked();
 
             // bootstrap initial stats to prevent double-counting later
@@ -386,7 +381,6 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
         mUidRecorder = null;
         mUidTagRecorder = null;
 
-        mDevStatsCached = null;
         mXtStatsCached = null;
 
         mSystemReady = false;
@@ -523,48 +517,24 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
     }
 
     /**
-     * Return network summary, splicing between {@link #mDevStatsCached}
-     * and {@link #mXtStatsCached} when appropriate.
+     * Return network summary, splicing between DEV and XT stats when
+     * appropriate.
      */
     private NetworkStats internalGetSummaryForNetwork(
             NetworkTemplate template, long start, long end) {
-        if (!mSettings.getReportXtOverDev()) {
-            // shortcut when XT reporting disabled
-            return mDevStatsCached.getSummary(template, start, end);
-        }
-
-        // splice stats between DEV and XT, switching over from DEV to XT at
-        // first atomic bucket.
-        final long firstAtomicBucket = mXtStatsCached.getFirstAtomicBucketMillis();
-        final NetworkStats dev = mDevStatsCached.getSummary(
-                template, Math.min(start, firstAtomicBucket), Math.min(end, firstAtomicBucket));
-        final NetworkStats xt = mXtStatsCached.getSummary(
-                template, Math.max(start, firstAtomicBucket), Math.max(end, firstAtomicBucket));
-
-        xt.combineAllValues(dev);
-        return xt;
+        // We've been using pure XT stats long enough that we no longer need to
+        // splice DEV and XT together.
+        return mXtStatsCached.getSummary(template, start, end);
     }
 
     /**
-     * Return network history, splicing between {@link #mDevStatsCached}
-     * and {@link #mXtStatsCached} when appropriate.
+     * Return network history, splicing between DEV and XT stats when
+     * appropriate.
      */
     private NetworkStatsHistory internalGetHistoryForNetwork(NetworkTemplate template, int fields) {
-        if (!mSettings.getReportXtOverDev()) {
-            // shortcut when XT reporting disabled
-            return mDevStatsCached.getHistory(template, UID_ALL, SET_ALL, TAG_NONE, fields);
-        }
-
-        // splice stats between DEV and XT, switching over from DEV to XT at
-        // first atomic bucket.
-        final long firstAtomicBucket = mXtStatsCached.getFirstAtomicBucketMillis();
-        final NetworkStatsHistory dev = mDevStatsCached.getHistory(
-                template, UID_ALL, SET_ALL, TAG_NONE, fields, Long.MIN_VALUE, firstAtomicBucket);
-        final NetworkStatsHistory xt = mXtStatsCached.getHistory(
-                template, UID_ALL, SET_ALL, TAG_NONE, fields, firstAtomicBucket, Long.MAX_VALUE);
-
-        xt.recordEntireHistory(dev);
-        return xt;
+        // We've been using pure XT stats long enough that we no longer need to
+        // splice DEV and XT together.
+        return mXtStatsCached.getHistory(template, UID_ALL, SET_ALL, TAG_NONE, fields);
     }
 
     @Override
@@ -1329,10 +1299,6 @@ public class NetworkStatsService extends INetworkStatsService.Stub {
             return getGlobalBoolean(NETSTATS_SAMPLE_ENABLED, true);
         }
         @Override
-        public boolean getReportXtOverDev() {
-            return getGlobalBoolean(NETSTATS_REPORT_XT_OVER_DEV, true);
-        }
-        @Override
         public Config getDevConfig() {
             return new Config(getGlobalLong(NETSTATS_DEV_BUCKET_DURATION, HOUR_IN_MILLIS),
                     getGlobalLong(NETSTATS_DEV_ROTATE_AGE, 15 * DAY_IN_MILLIS),