diff --git a/framework-t/api/module-lib-current.txt b/framework-t/api/module-lib-current.txt
index b284d4f..0f0c971 100644
--- a/framework-t/api/module-lib-current.txt
+++ b/framework-t/api/module-lib-current.txt
@@ -42,6 +42,7 @@
   public class NetworkIdentity {
     method public int getOemManaged();
     method public int getRatType();
+    method public int getSubId();
     method @Nullable public String getSubscriberId();
     method public int getType();
     method @Nullable public String getWifiNetworkKey();
@@ -60,6 +61,7 @@
     method @NonNull public android.net.NetworkIdentity.Builder setOemManaged(int);
     method @NonNull public android.net.NetworkIdentity.Builder setRatType(int);
     method @NonNull public android.net.NetworkIdentity.Builder setRoaming(boolean);
+    method @NonNull public android.net.NetworkIdentity.Builder setSubId(int);
     method @NonNull public android.net.NetworkIdentity.Builder setSubscriberId(@Nullable String);
     method @NonNull public android.net.NetworkIdentity.Builder setType(int);
     method @NonNull public android.net.NetworkIdentity.Builder setWifiNetworkKey(@Nullable String);
@@ -72,7 +74,8 @@
     method @NonNull public android.net.LinkProperties getLinkProperties();
     method @NonNull public android.net.Network getNetwork();
     method @NonNull public android.net.NetworkCapabilities getNetworkCapabilities();
-    method @Nullable public String getSubscriberId();
+    method public int getSubId();
+    method @Deprecated @Nullable public String getSubscriberId();
     method public void writeToParcel(@NonNull android.os.Parcel, int);
     field @NonNull public static final android.os.Parcelable.Creator<android.net.NetworkStateSnapshot> CREATOR;
   }
diff --git a/tests/unit/java/android/net/NetworkIdentityTest.kt b/tests/unit/java/android/net/NetworkIdentityTest.kt
index 4b2d874..bf5568d 100644
--- a/tests/unit/java/android/net/NetworkIdentityTest.kt
+++ b/tests/unit/java/android/net/NetworkIdentityTest.kt
@@ -22,6 +22,7 @@
 import android.net.ConnectivityManager.TYPE_MOBILE
 import android.net.ConnectivityManager.TYPE_NONE
 import android.net.ConnectivityManager.TYPE_WIFI
+import android.net.NetworkCapabilities.TRANSPORT_CELLULAR
 import android.net.NetworkIdentity.OEM_NONE
 import android.net.NetworkIdentity.OEM_PAID
 import android.net.NetworkIdentity.OEM_PRIVATE
@@ -39,8 +40,11 @@
 import kotlin.test.assertFalse
 import kotlin.test.assertTrue
 
-private const val TEST_IMSI = "testimsi"
 private const val TEST_WIFI_KEY = "testwifikey"
+private const val TEST_IMSI1 = "testimsi1"
+private const val TEST_IMSI2 = "testimsi2"
+private const val TEST_SUBID1 = 1
+private const val TEST_SUBID2 = 2
 
 @RunWith(DevSdkIgnoreRunner::class)
 @DevSdkIgnoreRule.IgnoreUpTo(Build.VERSION_CODES.R)
@@ -84,7 +88,7 @@
     fun testIsMetered() {
         // Verify network is metered.
         val netIdent1 = NetworkIdentity.buildNetworkIdentity(mockContext,
-                buildMobileNetworkStateSnapshot(NetworkCapabilities(), TEST_IMSI),
+                buildMobileNetworkStateSnapshot(NetworkCapabilities(), TEST_IMSI1),
                 false /* defaultNetwork */, TelephonyManager.NETWORK_TYPE_UMTS)
         assertTrue(netIdent1.isMetered())
 
@@ -93,7 +97,7 @@
             addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_METERED)
         }.build()
         val netIdent2 = NetworkIdentity.buildNetworkIdentity(mockContext,
-                buildMobileNetworkStateSnapshot(capsNotMetered, TEST_IMSI),
+                buildMobileNetworkStateSnapshot(capsNotMetered, TEST_IMSI1),
                 false /* defaultNetwork */, TelephonyManager.NETWORK_TYPE_UMTS)
         assertFalse(netIdent2.isMetered())
 
@@ -103,33 +107,38 @@
             setCapability(NetworkCapabilities.NET_CAPABILITY_TEMPORARILY_NOT_METERED, true)
         }
         val netIdent3 = NetworkIdentity.buildNetworkIdentity(mockContext,
-                buildMobileNetworkStateSnapshot(capsTempNotMetered, TEST_IMSI),
+                buildMobileNetworkStateSnapshot(capsTempNotMetered, TEST_IMSI1),
                 false /* defaultNetwork */, TelephonyManager.NETWORK_TYPE_UMTS)
         assertFalse(netIdent3.isMetered())
     }
 
     @Test
     fun testBuilder() {
+        val specifier1 = TelephonyNetworkSpecifier(TEST_SUBID1)
         val oemPrivateRoamingNotMeteredCap = NetworkCapabilities().apply {
             addCapability(NetworkCapabilities.NET_CAPABILITY_OEM_PRIVATE)
             addCapability(NetworkCapabilities.NET_CAPABILITY_NOT_METERED)
+            addTransportType(TRANSPORT_CELLULAR)
+            setNetworkSpecifier(specifier1)
         }
         val identFromSnapshot = NetworkIdentity.Builder().setNetworkStateSnapshot(
-                buildMobileNetworkStateSnapshot(oemPrivateRoamingNotMeteredCap, TEST_IMSI))
+                buildMobileNetworkStateSnapshot(oemPrivateRoamingNotMeteredCap, TEST_IMSI1))
                 .setDefaultNetwork(true)
                 .setRatType(TelephonyManager.NETWORK_TYPE_UMTS)
+                .setSubId(TEST_SUBID1)
                 .build()
         val identFromLegacyBuild = NetworkIdentity.buildNetworkIdentity(mockContext,
-                buildMobileNetworkStateSnapshot(oemPrivateRoamingNotMeteredCap, TEST_IMSI),
+                buildMobileNetworkStateSnapshot(oemPrivateRoamingNotMeteredCap, TEST_IMSI1),
                 true /* defaultNetwork */, TelephonyManager.NETWORK_TYPE_UMTS)
         val identFromConstructor = NetworkIdentity(TYPE_MOBILE,
                 TelephonyManager.NETWORK_TYPE_UMTS,
-                TEST_IMSI,
+                TEST_IMSI1,
                 null /* wifiNetworkKey */,
                 true /* roaming */,
                 false /* metered */,
                 true /* defaultNetwork */,
-                NetworkTemplate.OEM_MANAGED_PRIVATE)
+                NetworkTemplate.OEM_MANAGED_PRIVATE,
+                TEST_SUBID1)
         assertEquals(identFromLegacyBuild, identFromSnapshot)
         assertEquals(identFromConstructor, identFromSnapshot)
 
@@ -222,4 +231,28 @@
                             }
                 }
     }
+
+    @Test
+    fun testGetSubId() {
+        val specifier1 = TelephonyNetworkSpecifier(TEST_SUBID1)
+        val specifier2 = TelephonyNetworkSpecifier(TEST_SUBID2)
+        val capSUBID1 = NetworkCapabilities().apply {
+            addTransportType(TRANSPORT_CELLULAR)
+            setNetworkSpecifier(specifier1)
+        }
+        val capSUBID2 = NetworkCapabilities().apply {
+            addTransportType(TRANSPORT_CELLULAR)
+            setNetworkSpecifier(specifier2)
+        }
+
+        val netIdent1 = NetworkIdentity.buildNetworkIdentity(mockContext,
+                buildMobileNetworkStateSnapshot(capSUBID1, TEST_IMSI1),
+                false /* defaultNetwork */, TelephonyManager.NETWORK_TYPE_UMTS)
+        assertEquals(TEST_SUBID1, netIdent1.getSubId())
+
+        val netIdent2 = NetworkIdentity.buildNetworkIdentity(mockContext,
+                buildMobileNetworkStateSnapshot(capSUBID2, TEST_IMSI2),
+                false /* defaultNetwork */, TelephonyManager.NETWORK_TYPE_UMTS)
+        assertEquals(TEST_SUBID2, netIdent2.getSubId())
+    }
 }
diff --git a/tests/unit/java/android/net/NetworkStatsCollectionTest.java b/tests/unit/java/android/net/NetworkStatsCollectionTest.java
index c27ee93..32c106d 100644
--- a/tests/unit/java/android/net/NetworkStatsCollectionTest.java
+++ b/tests/unit/java/android/net/NetworkStatsCollectionTest.java
@@ -87,6 +87,7 @@
 
     private static final String TEST_FILE = "test.bin";
     private static final String TEST_IMSI = "310260000000000";
+    private static final int TEST_SUBID = 1;
 
     private static final long TIME_A = 1326088800000L; // UTC: Monday 9th January 2012 06:00:00 AM
     private static final long TIME_B = 1326110400000L; // UTC: Monday 9th January 2012 12:00:00 PM
@@ -213,7 +214,7 @@
         final NetworkStats.Entry entry = new NetworkStats.Entry();
         final NetworkIdentitySet identSet = new NetworkIdentitySet();
         identSet.add(new NetworkIdentity(TYPE_MOBILE, TelephonyManager.NETWORK_TYPE_UNKNOWN,
-                TEST_IMSI, null, false, true, true, OEM_NONE));
+                TEST_IMSI, null, false, true, true, OEM_NONE, TEST_SUBID));
 
         int myUid = Process.myUid();
         int otherUidInSameUser = Process.myUid() + 1;
@@ -475,7 +476,7 @@
         final NetworkStatsCollection large = new NetworkStatsCollection(HOUR_IN_MILLIS);
         final NetworkIdentitySet ident = new NetworkIdentitySet();
         ident.add(new NetworkIdentity(ConnectivityManager.TYPE_MOBILE, -1, TEST_IMSI, null,
-                false, true, true, OEM_NONE));
+                false, true, true, OEM_NONE, TEST_SUBID));
         large.recordData(ident, UID_ALL, SET_ALL, TAG_NONE, TIME_A, TIME_B,
                 new NetworkStats.Entry(12_730_893_164L, 1, 0, 0, 0));
 
diff --git a/tests/unit/java/android/net/netstats/NetworkStatsDataMigrationUtilsTest.kt b/tests/unit/java/android/net/netstats/NetworkStatsDataMigrationUtilsTest.kt
index e4943ea..743d39e 100644
--- a/tests/unit/java/android/net/netstats/NetworkStatsDataMigrationUtilsTest.kt
+++ b/tests/unit/java/android/net/netstats/NetworkStatsDataMigrationUtilsTest.kt
@@ -46,7 +46,7 @@
 
     @Test
     fun testReadPlatformCollection() {
-        // Verify the method throws for wrong file version.
+        // Verify the method throws for wrong file format.
         assertFailsWith<ProtocolException> {
             NetworkStatsDataMigrationUtils.readPlatformCollection(
                     NetworkStatsCollection.Builder(BUCKET_DURATION_MS),
diff --git a/tests/unit/java/com/android/server/net/NetworkStatsObserversTest.java b/tests/unit/java/com/android/server/net/NetworkStatsObserversTest.java
index 66dcf6d..f447709 100644
--- a/tests/unit/java/com/android/server/net/NetworkStatsObserversTest.java
+++ b/tests/unit/java/com/android/server/net/NetworkStatsObserversTest.java
@@ -78,6 +78,7 @@
 
     private static final String IMSI_1 = "310004";
     private static final String IMSI_2 = "310260";
+    private static final int SUBID_1 = 1;
     private static final String TEST_SSID = "AndroidAP";
 
     private static NetworkTemplate sTemplateWifi = buildTemplateWifiWildcard();
@@ -224,7 +225,7 @@
         identSet.add(new NetworkIdentity(
                 TYPE_MOBILE, TelephonyManager.NETWORK_TYPE_UNKNOWN,
                 IMSI_1, null /* networkId */, false /* roaming */, true /* metered */,
-                true /* defaultNetwork */, OEM_NONE));
+                true /* defaultNetwork */, OEM_NONE, SUBID_1));
         return identSet;
     }