diff --git a/tests/unit/java/com/android/server/net/NetworkStatsFactoryTest.java b/tests/unit/java/com/android/server/net/NetworkStatsFactoryTest.java
index f3ae9b0..93599f3 100644
--- a/tests/unit/java/com/android/server/net/NetworkStatsFactoryTest.java
+++ b/tests/unit/java/com/android/server/net/NetworkStatsFactoryTest.java
@@ -43,6 +43,7 @@
 import androidx.test.runner.AndroidJUnit4;
 
 import com.android.frameworks.tests.net.R;
+import com.android.internal.util.test.FsUtil;
 
 import libcore.io.IoUtils;
 import libcore.io.Streams;
@@ -71,7 +72,7 @@
     public void setUp() throws Exception {
         mTestProc = new File(InstrumentationRegistry.getContext().getFilesDir(), "proc");
         if (mTestProc.exists()) {
-            IoUtils.deleteContents(mTestProc);
+            FsUtil.deleteContents(mTestProc);
         }
 
         // The libandroid_servers which have the native method is not available to
@@ -87,7 +88,7 @@
         mFactory = null;
 
         if (mTestProc.exists()) {
-            IoUtils.deleteContents(mTestProc);
+            FsUtil.deleteContents(mTestProc);
         }
     }
 
diff --git a/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java b/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
index fe2985c..0ba5f7d 100644
--- a/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
+++ b/tests/unit/java/com/android/server/net/NetworkStatsServiceTest.java
@@ -112,13 +112,12 @@
 
 import com.android.internal.util.ArrayUtils;
 import com.android.internal.util.test.BroadcastInterceptingContext;
+import com.android.internal.util.test.FsUtil;
 import com.android.server.net.NetworkStatsService.NetworkStatsSettings;
 import com.android.server.net.NetworkStatsService.NetworkStatsSettings.Config;
 import com.android.testutils.HandlerUtils;
 import com.android.testutils.TestableNetworkStatsProviderBinder;
 
-import libcore.io.IoUtils;
-
 import org.junit.After;
 import org.junit.Before;
 import org.junit.Ignore;
@@ -152,6 +151,8 @@
     private static final String TEST_SSID = "AndroidAP";
 
     private static NetworkTemplate sTemplateWifi = buildTemplateWifi(TEST_SSID);
+    private static NetworkTemplate sTemplateCarrierWifi1 =
+            buildTemplateWifi(NetworkTemplate.WIFI_NETWORKID_ALL, IMSI_1);
     private static NetworkTemplate sTemplateImsi1 = buildTemplateMobileAll(IMSI_1);
     private static NetworkTemplate sTemplateImsi2 = buildTemplateMobileAll(IMSI_2);
 
@@ -213,7 +214,7 @@
         mServiceContext = new MockContext(context);
         mStatsDir = context.getFilesDir();
         if (mStatsDir.exists()) {
-            IoUtils.deleteContents(mStatsDir);
+            FsUtil.deleteContents(mStatsDir);
         }
 
         PowerManager powerManager = (PowerManager) mServiceContext.getSystemService(
@@ -283,7 +284,7 @@
 
     @After
     public void tearDown() throws Exception {
-        IoUtils.deleteContents(mStatsDir);
+        FsUtil.deleteContents(mStatsDir);
 
         mServiceContext = null;
         mStatsDir = null;
@@ -297,45 +298,82 @@
         mHandlerThread.quitSafely();
     }
 
-    @Test
-    public void testNetworkStatsWifi() throws Exception {
+    private void initWifiStats(NetworkStateSnapshot snapshot) throws Exception {
         // pretend that wifi network comes online; service should ask about full
         // network state, and poll any existing interfaces before updating.
         expectDefaultSettings();
-        NetworkStateSnapshot[] states = new NetworkStateSnapshot[] {buildWifiState()};
+        NetworkStateSnapshot[] states = new NetworkStateSnapshot[] {snapshot};
         expectNetworkStatsSummary(buildEmptyStats());
         expectNetworkStatsUidDetail(buildEmptyStats());
 
         mService.notifyNetworkStatus(NETWORKS_WIFI, states, getActiveIface(states),
                 new UnderlyingNetworkInfo[0]);
+    }
 
-        // verify service has empty history for wifi
+    private void incrementWifiStats(long durationMillis, String iface,
+            long rxb, long rxp, long txb, long txp) throws Exception {
+        incrementCurrentTime(durationMillis);
+        expectDefaultSettings();
+        expectNetworkStatsSummary(new NetworkStats(getElapsedRealtime(), 1)
+                .insertEntry(iface, rxb, rxp, txb, txp));
+        expectNetworkStatsUidDetail(buildEmptyStats());
+        forcePollAndWaitForIdle();
+    }
+
+    @Test
+    public void testNetworkStatsCarrierWifi() throws Exception {
+        initWifiStats(buildWifiState(true, TEST_IFACE, IMSI_1));
+        // verify service has empty history for carrier merged wifi and non-carrier wifi
+        assertNetworkTotal(sTemplateCarrierWifi1, 0L, 0L, 0L, 0L, 0);
         assertNetworkTotal(sTemplateWifi, 0L, 0L, 0L, 0L, 0);
 
         // modify some number on wifi, and trigger poll event
-        incrementCurrentTime(HOUR_IN_MILLIS);
-        expectDefaultSettings();
-        expectNetworkStatsSummary(new NetworkStats(getElapsedRealtime(), 1)
-                .insertEntry(TEST_IFACE, 1024L, 1L, 2048L, 2L));
-        expectNetworkStatsUidDetail(buildEmptyStats());
-        forcePollAndWaitForIdle();
+        incrementWifiStats(HOUR_IN_MILLIS, TEST_IFACE, 1024L, 1L, 2048L, 2L);
 
         // verify service recorded history
-        assertNetworkTotal(sTemplateWifi, 1024L, 1L, 2048L, 2L, 0);
+        assertNetworkTotal(sTemplateCarrierWifi1, 1024L, 1L, 2048L, 2L, 0);
+
+        // verify service recorded history for wifi with SSID filter
+        assertNetworkTotal(sTemplateWifi,  1024L, 1L, 2048L, 2L, 0);
 
 
         // and bump forward again, with counters going higher. this is
         // important, since polling should correctly subtract last snapshot.
-        incrementCurrentTime(DAY_IN_MILLIS);
-        expectDefaultSettings();
-        expectNetworkStatsSummary(new NetworkStats(getElapsedRealtime(), 1)
-                .insertEntry(TEST_IFACE, 4096L, 4L, 8192L, 8L));
-        expectNetworkStatsUidDetail(buildEmptyStats());
-        forcePollAndWaitForIdle();
+        incrementWifiStats(DAY_IN_MILLIS, TEST_IFACE, 4096L, 4L, 8192L, 8L);
+
+        // verify service recorded history
+        assertNetworkTotal(sTemplateCarrierWifi1, 4096L, 4L, 8192L, 8L, 0);
+        // verify service recorded history for wifi with SSID filter
+        assertNetworkTotal(sTemplateWifi, 4096L, 4L, 8192L, 8L, 0);
+    }
+
+    @Test
+    public void testNetworkStatsNonCarrierWifi() throws Exception {
+        initWifiStats(buildWifiState());
+
+        // verify service has empty history for wifi
+        assertNetworkTotal(sTemplateWifi, 0L, 0L, 0L, 0L, 0);
+        // verify service has empty history for carrier merged wifi
+        assertNetworkTotal(sTemplateCarrierWifi1, 0L, 0L, 0L, 0L, 0);
+
+        // modify some number on wifi, and trigger poll event
+        incrementWifiStats(HOUR_IN_MILLIS, TEST_IFACE, 1024L, 1L, 2048L, 2L);
+
+        // verify service recorded history
+        assertNetworkTotal(sTemplateWifi, 1024L, 1L, 2048L, 2L, 0);
+        // verify service has empty history for carrier wifi since current network is non carrier
+        // wifi
+        assertNetworkTotal(sTemplateCarrierWifi1, 0L, 0L, 0L, 0L, 0);
+
+        // and bump forward again, with counters going higher. this is
+        // important, since polling should correctly subtract last snapshot.
+        incrementWifiStats(DAY_IN_MILLIS, TEST_IFACE, 4096L, 4L, 8192L, 8L);
 
         // verify service recorded history
         assertNetworkTotal(sTemplateWifi, 4096L, 4L, 8192L, 8L, 0);
-
+        // verify service has empty history for carrier wifi since current network is non carrier
+        // wifi
+        assertNetworkTotal(sTemplateCarrierWifi1, 0L, 0L, 0L, 0L, 0);
     }
 
     @Test
@@ -1662,10 +1700,15 @@
     }
 
     private static NetworkStateSnapshot buildWifiState() {
-        return buildWifiState(false, TEST_IFACE);
+        return buildWifiState(false, TEST_IFACE, null);
     }
 
     private static NetworkStateSnapshot buildWifiState(boolean isMetered, @NonNull String iface) {
+        return buildWifiState(isMetered, iface, null);
+    }
+
+    private static NetworkStateSnapshot buildWifiState(boolean isMetered, @NonNull String iface,
+            String subscriberId) {
         final LinkProperties prop = new LinkProperties();
         prop.setInterfaceName(iface);
         final NetworkCapabilities capabilities = new NetworkCapabilities();
@@ -1673,7 +1716,7 @@
         capabilities.setCapability(NetworkCapabilities.NET_CAPABILITY_NOT_ROAMING, true);
         capabilities.addTransportType(NetworkCapabilities.TRANSPORT_WIFI);
         capabilities.setSSID(TEST_SSID);
-        return new NetworkStateSnapshot(WIFI_NETWORK, capabilities, prop, null, TYPE_WIFI);
+        return new NetworkStateSnapshot(WIFI_NETWORK, capabilities, prop, subscriberId, TYPE_WIFI);
     }
 
     private static NetworkStateSnapshot buildMobile3gState(String subscriberId) {