diff --git a/framework-t/src/android/net/NetworkIdentity.java b/framework-t/src/android/net/NetworkIdentity.java
index 4ebaf2b..a48f94b 100644
--- a/framework-t/src/android/net/NetworkIdentity.java
+++ b/framework-t/src/android/net/NetworkIdentity.java
@@ -20,6 +20,7 @@
 import static android.net.ConnectivityManager.TYPE_MOBILE;
 import static android.net.ConnectivityManager.TYPE_WIFI;
 import static android.net.NetworkTemplate.NETWORK_TYPE_ALL;
+import static android.telephony.SubscriptionManager.INVALID_SUBSCRIPTION_ID;
 
 import android.annotation.IntDef;
 import android.annotation.NonNull;
@@ -86,6 +87,7 @@
 
     final int mType;
     final int mRatType;
+    final int mSubId;
     final String mSubscriberId;
     final String mWifiNetworkKey;
     final boolean mRoaming;
@@ -96,7 +98,7 @@
     /** @hide */
     public NetworkIdentity(
             int type, int ratType, @Nullable String subscriberId, @Nullable String wifiNetworkKey,
-            boolean roaming, boolean metered, boolean defaultNetwork, int oemManaged) {
+            boolean roaming, boolean metered, boolean defaultNetwork, int oemManaged, int subId) {
         mType = type;
         mRatType = ratType;
         mSubscriberId = subscriberId;
@@ -105,12 +107,13 @@
         mMetered = metered;
         mDefaultNetwork = defaultNetwork;
         mOemManaged = oemManaged;
+        mSubId = subId;
     }
 
     @Override
     public int hashCode() {
         return Objects.hash(mType, mRatType, mSubscriberId, mWifiNetworkKey, mRoaming, mMetered,
-                mDefaultNetwork, mOemManaged);
+                mDefaultNetwork, mOemManaged, mSubId);
     }
 
     @Override
@@ -122,7 +125,8 @@
                     && Objects.equals(mWifiNetworkKey, ident.mWifiNetworkKey)
                     && mMetered == ident.mMetered
                     && mDefaultNetwork == ident.mDefaultNetwork
-                    && mOemManaged == ident.mOemManaged;
+                    && mOemManaged == ident.mOemManaged
+                    && mSubId == ident.mSubId;
         }
         return false;
     }
@@ -150,6 +154,7 @@
         builder.append(", metered=").append(mMetered);
         builder.append(", defaultNetwork=").append(mDefaultNetwork);
         builder.append(", oemManaged=").append(getOemManagedNames(mOemManaged));
+        builder.append(", subId=").append(mSubId);
         return builder.append("}").toString();
     }
 
@@ -256,6 +261,11 @@
         return mOemManaged;
     }
 
+    /** Get the SubId of this instance. */
+    public int getSubId() {
+        return mSubId;
+    }
+
     /**
      * Assemble a {@link NetworkIdentity} from the passed arguments.
      *
@@ -276,7 +286,8 @@
     public static NetworkIdentity buildNetworkIdentity(Context context,
             @NonNull NetworkStateSnapshot snapshot, boolean defaultNetwork, int ratType) {
         final NetworkIdentity.Builder builder = new NetworkIdentity.Builder()
-                .setNetworkStateSnapshot(snapshot).setDefaultNetwork(defaultNetwork);
+                .setNetworkStateSnapshot(snapshot).setDefaultNetwork(defaultNetwork)
+                .setSubId(snapshot.getSubId());
         if (snapshot.getLegacyType() == TYPE_MOBILE && ratType != NETWORK_TYPE_ALL) {
             builder.setRatType(ratType);
         }
@@ -325,6 +336,9 @@
         if (res == 0) {
             res = Integer.compare(left.mOemManaged, right.mOemManaged);
         }
+        if (res == 0) {
+            res = Integer.compare(left.mSubId, right.mSubId);
+        }
         return res;
     }
 
@@ -345,6 +359,7 @@
         private boolean mMetered;
         private boolean mDefaultNetwork;
         private int mOemManaged;
+        private int mSubId;
 
         /**
          * Creates a new Builder.
@@ -359,6 +374,7 @@
             mMetered = false;
             mDefaultNetwork = false;
             mOemManaged = NetworkTemplate.OEM_MANAGED_NO;
+            mSubId = INVALID_SUBSCRIPTION_ID;
         }
 
         /**
@@ -537,6 +553,19 @@
             return this;
         }
 
+        /**
+         * Set the Subscription Id.
+         *
+         * @param subId the Subscription Id of the network. Or INVALID_SUBSCRIPTION_ID if not
+         *              applicable.
+         * @return this builder.
+         */
+        @NonNull
+        public Builder setSubId(int subId) {
+            mSubId = subId;
+            return this;
+        }
+
         private void ensureValidParameters() {
             // Assert non-mobile network cannot have a ratType.
             if (mType != TYPE_MOBILE && mRatType != NetworkTemplate.NETWORK_TYPE_ALL) {
@@ -559,7 +588,7 @@
         public NetworkIdentity build() {
             ensureValidParameters();
             return new NetworkIdentity(mType, mRatType, mSubscriberId, mWifiNetworkKey,
-                    mRoaming, mMetered, mDefaultNetwork, mOemManaged);
+                    mRoaming, mMetered, mDefaultNetwork, mOemManaged, mSubId);
         }
     }
 }
diff --git a/framework-t/src/android/net/NetworkIdentitySet.java b/framework-t/src/android/net/NetworkIdentitySet.java
index 2236d70..56461ba 100644
--- a/framework-t/src/android/net/NetworkIdentitySet.java
+++ b/framework-t/src/android/net/NetworkIdentitySet.java
@@ -17,6 +17,7 @@
 package android.net;
 
 import static android.net.ConnectivityManager.TYPE_MOBILE;
+import static android.telephony.SubscriptionManager.INVALID_SUBSCRIPTION_ID;
 
 import android.annotation.NonNull;
 import android.service.NetworkIdentitySetProto;
@@ -42,6 +43,7 @@
     private static final int VERSION_ADD_METERED = 4;
     private static final int VERSION_ADD_DEFAULT_NETWORK = 5;
     private static final int VERSION_ADD_OEM_MANAGED_NETWORK = 6;
+    private static final int VERSION_ADD_SUB_ID = 7;
 
     /**
      * Construct a {@link NetworkIdentitySet} object.
@@ -103,8 +105,15 @@
                 oemNetCapabilities = NetworkIdentity.OEM_NONE;
             }
 
+            final int subId;
+            if (version >= VERSION_ADD_SUB_ID) {
+                subId = in.readInt();
+            } else {
+                subId = INVALID_SUBSCRIPTION_ID;
+            }
+
             add(new NetworkIdentity(type, ratType, subscriberId, networkId, roaming, metered,
-                    defaultNetwork, oemNetCapabilities));
+                    defaultNetwork, oemNetCapabilities, subId));
         }
     }
 
@@ -113,7 +122,7 @@
      * @hide
      */
     public void writeToStream(DataOutput out) throws IOException {
-        out.writeInt(VERSION_ADD_OEM_MANAGED_NETWORK);
+        out.writeInt(VERSION_ADD_SUB_ID);
         out.writeInt(size());
         for (NetworkIdentity ident : this) {
             out.writeInt(ident.getType());
@@ -124,6 +133,7 @@
             out.writeBoolean(ident.isMetered());
             out.writeBoolean(ident.isDefaultNetwork());
             out.writeInt(ident.getOemManaged());
+            out.writeInt(ident.getSubId());
         }
     }
 
diff --git a/framework-t/src/android/net/NetworkStateSnapshot.java b/framework-t/src/android/net/NetworkStateSnapshot.java
index 3915634..d3f785a 100644
--- a/framework-t/src/android/net/NetworkStateSnapshot.java
+++ b/framework-t/src/android/net/NetworkStateSnapshot.java
@@ -17,6 +17,8 @@
 package android.net;
 
 import static android.annotation.SystemApi.Client.MODULE_LIBRARIES;
+import static android.net.NetworkCapabilities.TRANSPORT_CELLULAR;
+import static android.telephony.SubscriptionManager.INVALID_SUBSCRIPTION_ID;
 
 import android.annotation.NonNull;
 import android.annotation.Nullable;
@@ -98,12 +100,29 @@
         return mLinkProperties;
     }
 
-    /** Get the Subscriber Id of the network associated with this snapshot. */
+    /**
+     * Get the Subscriber Id of the network associated with this snapshot.
+     * @deprecated Please use #getSubId, which doesn't return personally identifiable
+     * information.
+     */
+    @Deprecated
     @Nullable
     public String getSubscriberId() {
         return mSubscriberId;
     }
 
+    /** Get the subId of the network associated with this snapshot. */
+    public int getSubId() {
+        if (mNetworkCapabilities.hasTransport(TRANSPORT_CELLULAR)) {
+            final NetworkSpecifier spec = mNetworkCapabilities.getNetworkSpecifier();
+            if (spec instanceof TelephonyNetworkSpecifier) {
+                return ((TelephonyNetworkSpecifier) spec).getSubscriptionId();
+            }
+        }
+        return INVALID_SUBSCRIPTION_ID;
+    }
+
+
     /**
      * Get the legacy type of the network associated with this snapshot.
      * @return the legacy network type. See {@code ConnectivityManager#TYPE_*}.
diff --git a/service-t/src/com/android/server/net/NetworkStatsService.java b/service-t/src/com/android/server/net/NetworkStatsService.java
index 1579f1e..ccca3da 100644
--- a/service-t/src/com/android/server/net/NetworkStatsService.java
+++ b/service-t/src/com/android/server/net/NetworkStatsService.java
@@ -1540,10 +1540,15 @@
                         NetworkCapabilities.NET_CAPABILITY_IMS) && !ident.isMetered()) {
 
                     // Copy the identify from IMS one but mark it as metered.
-                    NetworkIdentity vtIdent = new NetworkIdentity(ident.getType(),
-                            ident.getRatType(), ident.getSubscriberId(), ident.getWifiNetworkKey(),
-                            ident.isRoaming(), true /* metered */,
-                            true /* onDefaultNetwork */, ident.getOemManaged());
+                    NetworkIdentity vtIdent = new NetworkIdentity.Builder()
+                            .setType(ident.getType())
+                            .setRatType(ident.getRatType())
+                            .setSubscriberId(ident.getSubscriberId())
+                            .setWifiNetworkKey(ident.getWifiNetworkKey())
+                            .setRoaming(ident.isRoaming()).setMetered(true)
+                            .setDefaultNetwork(true)
+                            .setOemManaged(ident.getOemManaged())
+                            .setSubId(ident.getSubId()).build();
                     final String ifaceVt = IFACE_VT + getSubIdForMobile(snapshot);
                     findOrCreateNetworkIdentitySet(mActiveIfaces, ifaceVt).add(vtIdent);
                     findOrCreateNetworkIdentitySet(mActiveUidIfaces, ifaceVt).add(vtIdent);