diff --git a/api/system-current.txt b/api/system-current.txt
index a9fd0cd646dfe..88783e0151eec 100644
--- a/api/system-current.txt
+++ b/api/system-current.txt
@@ -8033,7 +8033,7 @@ package android.telephony {
   }
 
   public final class SmsCbMessage implements android.os.Parcelable {
-    ctor public SmsCbMessage(int, int, int, @NonNull android.telephony.SmsCbLocation, int, @Nullable String, @Nullable String, int, @Nullable android.telephony.SmsCbEtwsInfo, @Nullable android.telephony.SmsCbCmasInfo);
+    ctor public SmsCbMessage(int, int, int, @NonNull android.telephony.SmsCbLocation, int, @Nullable String, @Nullable String, int, @Nullable android.telephony.SmsCbEtwsInfo, @Nullable android.telephony.SmsCbCmasInfo, int);
     method @NonNull public static android.telephony.SmsCbMessage createFromCursor(@NonNull android.database.Cursor);
     method public int describeContents();
     method @Nullable public android.telephony.SmsCbCmasInfo getCmasWarningInfo();
@@ -8048,6 +8048,7 @@ package android.telephony {
     method public long getReceivedTime();
     method public int getSerialNumber();
     method public int getServiceCategory();
+    method public int getSlotIndex();
     method public boolean isCmasMessage();
     method public boolean isEmergencyMessage();
     method public boolean isEtwsMessage();
diff --git a/telephony/java/android/provider/Telephony.java b/telephony/java/android/provider/Telephony.java
index ddda010a94a4e..d3728a6dd1786 100644
--- a/telephony/java/android/provider/Telephony.java
+++ b/telephony/java/android/provider/Telephony.java
@@ -3963,12 +3963,20 @@ public final class Telephony {
         public static final Uri CONTENT_URI = Uri.parse("content://cellbroadcasts");
 
         /**
-         * The id of the subscription which received this cell broadcast message.
+         * The subscription which received this cell broadcast message.
+         * @deprecated use {@link #SLOT_INDEX} instead.
          * <P>Type: INTEGER</P>
          * @hide
          */
         public static final String SUB_ID = "sub_id";
 
+        /**
+         * The slot which received this cell broadcast message.
+         * <P>Type: INTEGER</P>
+         * @hide
+         */
+        public static final String SLOT_INDEX = "slot_index";
+
         /**
          * Message geographical scope. Valid values are:
          * <ul>
@@ -4203,7 +4211,7 @@ public final class Telephony {
         public static final String MAXIMUM_WAIT_TIME = "maximum_wait_time";
 
         /**
-         * Query columns for instantiating {@link android.telephony.CellBroadcastMessage} objects.
+         * Query columns for instantiating com.android.cellbroadcastreceiver.CellBroadcastMessage.
          * @hide
          */
         @NonNull
@@ -4236,6 +4244,7 @@ public final class Telephony {
          */
         public static final String[] QUERY_COLUMNS_FWK = {
                 _ID,
+                SLOT_INDEX,
                 GEOGRAPHICAL_SCOPE,
                 PLMN,
                 LAC,
diff --git a/telephony/java/android/telephony/SmsCbMessage.java b/telephony/java/android/telephony/SmsCbMessage.java
index c078764cfa246..dc991b9a3ea71 100644
--- a/telephony/java/android/telephony/SmsCbMessage.java
+++ b/telephony/java/android/telephony/SmsCbMessage.java
@@ -207,17 +207,19 @@ public final class SmsCbMessage implements Parcelable {
     /** CMAS warning area coordinates. */
     private final List<Geometry> mGeometries;
 
+    private int mSlotIndex = 0;
+
     /**
      * Create a new SmsCbMessage with the specified data.
      */
     public SmsCbMessage(int messageFormat, int geographicalScope, int serialNumber,
             @NonNull SmsCbLocation location, int serviceCategory, @Nullable String language,
             @Nullable String body, int priority, @Nullable SmsCbEtwsInfo etwsWarningInfo,
-            @Nullable SmsCbCmasInfo cmasWarningInfo) {
+            @Nullable SmsCbCmasInfo cmasWarningInfo, int slotIndex) {
 
         this(messageFormat, geographicalScope, serialNumber, location, serviceCategory, language,
                 body, priority, etwsWarningInfo, cmasWarningInfo, 0 /* maximumWaitingTime */,
-                null /* geometries */, System.currentTimeMillis());
+                null /* geometries */, System.currentTimeMillis(), slotIndex);
     }
 
     /**
@@ -227,7 +229,8 @@ public final class SmsCbMessage implements Parcelable {
     public SmsCbMessage(int messageFormat, int geographicalScope, int serialNumber,
             SmsCbLocation location, int serviceCategory, String language, String body,
             int priority, SmsCbEtwsInfo etwsWarningInfo, SmsCbCmasInfo cmasWarningInfo,
-            int maximumWaitTimeSec, List<Geometry> geometries, long receivedTimeMillis) {
+            int maximumWaitTimeSec, List<Geometry> geometries, long receivedTimeMillis,
+            int slotIndex) {
         mMessageFormat = messageFormat;
         mGeographicalScope = geographicalScope;
         mSerialNumber = serialNumber;
@@ -241,6 +244,7 @@ public final class SmsCbMessage implements Parcelable {
         mReceivedTimeMillis = receivedTimeMillis;
         mGeometries = geometries;
         mMaximumWaitTimeSec = maximumWaitTimeSec;
+        mSlotIndex = slotIndex;
     }
 
     /**
@@ -278,6 +282,7 @@ public final class SmsCbMessage implements Parcelable {
         String geoStr = in.readString();
         mGeometries = geoStr != null ? CbGeoUtils.parseGeometriesFromString(geoStr) : null;
         mMaximumWaitTimeSec = in.readInt();
+        mSlotIndex = in.readInt();
     }
 
     /**
@@ -312,6 +317,7 @@ public final class SmsCbMessage implements Parcelable {
         dest.writeString(
                 mGeometries != null ? CbGeoUtils.encodeGeometriesToString(mGeometries) : null);
         dest.writeInt(mMaximumWaitTimeSec);
+        dest.writeInt(mSlotIndex);
     }
 
     @NonNull
@@ -422,6 +428,14 @@ public final class SmsCbMessage implements Parcelable {
         return mReceivedTimeMillis;
     }
 
+    /**
+     * Get the slotIndex associated with this message.
+     * @return the slotIndex associated with this message
+     */
+    public int getSlotIndex() {
+        return mSlotIndex;
+    }
+
     /**
      * Get the message format ({@link #MESSAGE_FORMAT_3GPP} or {@link #MESSAGE_FORMAT_3GPP2}).
      * @return an integer representing 3GPP or 3GPP2 message format
@@ -502,6 +516,7 @@ public final class SmsCbMessage implements Parcelable {
                 + (mEtwsWarningInfo != null ? (", " + mEtwsWarningInfo.toString()) : "")
                 + (mCmasWarningInfo != null ? (", " + mCmasWarningInfo.toString()) : "")
                 + ", maximumWaitingTime = " + mMaximumWaitTimeSec
+                + ", slotIndex = " + mSlotIndex
                 + ", geo=" + (mGeometries != null
                 ? CbGeoUtils.encodeGeometriesToString(mGeometries) : "null")
                 + '}';
@@ -522,6 +537,7 @@ public final class SmsCbMessage implements Parcelable {
     @NonNull
     public ContentValues getContentValues() {
         ContentValues cv = new ContentValues(16);
+        cv.put(CellBroadcasts.SLOT_INDEX, mSlotIndex);
         cv.put(CellBroadcasts.GEOGRAPHICAL_SCOPE, mGeographicalScope);
         if (mLocation.getPlmn() != null) {
             cv.put(CellBroadcasts.PLMN, mLocation.getPlmn());
@@ -563,6 +579,7 @@ public final class SmsCbMessage implements Parcelable {
         }
 
         cv.put(CellBroadcasts.MAXIMUM_WAIT_TIME, mMaximumWaitTimeSec);
+        cv.put(CellBroadcasts.SLOT_INDEX, mSlotIndex);
 
         return cv;
     }
@@ -584,6 +601,7 @@ public final class SmsCbMessage implements Parcelable {
         String body = cursor.getString(cursor.getColumnIndexOrThrow(CellBroadcasts.MESSAGE_BODY));
         int format = cursor.getInt(cursor.getColumnIndexOrThrow(CellBroadcasts.MESSAGE_FORMAT));
         int priority = cursor.getInt(cursor.getColumnIndexOrThrow(CellBroadcasts.MESSAGE_PRIORITY));
+        int slotIndex = cursor.getInt(cursor.getColumnIndexOrThrow(CellBroadcasts.SLOT_INDEX));
 
         String plmn;
         int plmnColumn = cursor.getColumnIndex(CellBroadcasts.PLMN);
@@ -681,7 +699,7 @@ public final class SmsCbMessage implements Parcelable {
 
         return new SmsCbMessage(format, geoScope, serialNum, location, category,
                 language, body, priority, etwsInfo, cmasInfo, maximumWaitTimeSec, geometries,
-                receivedTimeMillis);
+                receivedTimeMillis, slotIndex);
     }
 
     /**
diff --git a/telephony/java/com/android/internal/telephony/cdma/SmsMessage.java b/telephony/java/com/android/internal/telephony/cdma/SmsMessage.java
index ebc98d61547ee..2a1642140222c 100644
--- a/telephony/java/com/android/internal/telephony/cdma/SmsMessage.java
+++ b/telephony/java/com/android/internal/telephony/cdma/SmsMessage.java
@@ -859,8 +859,9 @@ public class SmsMessage extends SmsMessageBase {
      * Parses a broadcast SMS, possibly containing a CMAS alert.
      *
      * @param plmn the PLMN for a broadcast SMS
+     * @param subId
      */
-    public SmsCbMessage parseBroadcastSms(String plmn) {
+    public SmsCbMessage parseBroadcastSms(String plmn, int subId) {
         BearerData bData = BearerData.decode(mEnvelope.bearerData, mEnvelope.serviceCategory);
         if (bData == null) {
             Rlog.w(LOG_TAG, "BearerData.decode() returned null");
@@ -876,7 +877,7 @@ public class SmsMessage extends SmsMessageBase {
         return new SmsCbMessage(SmsCbMessage.MESSAGE_FORMAT_3GPP2,
                 SmsCbMessage.GEOGRAPHICAL_SCOPE_PLMN_WIDE, bData.messageId, location,
                 mEnvelope.serviceCategory, bData.getLanguage(), bData.userData.payloadStr,
-                bData.priority, null, bData.cmasWarningInfo);
+                bData.priority, null, bData.cmasWarningInfo, subId);
     }
 
     /**
diff --git a/telephony/java/com/android/internal/telephony/gsm/GsmSmsCbMessage.java b/telephony/java/com/android/internal/telephony/gsm/GsmSmsCbMessage.java
index c65c45fa015b1..c3d490a6d5cfa 100644
--- a/telephony/java/com/android/internal/telephony/gsm/GsmSmsCbMessage.java
+++ b/telephony/java/com/android/internal/telephony/gsm/GsmSmsCbMessage.java
@@ -90,9 +90,10 @@ public class GsmSmsCbMessage {
      * Create a new SmsCbMessage object from a header object plus one or more received PDUs.
      *
      * @param pdus PDU bytes
+     * @slotIndex slotIndex for which received sms cb message
      */
     public static SmsCbMessage createSmsCbMessage(Context context, SmsCbHeader header,
-            SmsCbLocation location, byte[][] pdus)
+            SmsCbLocation location, byte[][] pdus, int slotIndex)
             throws IllegalArgumentException {
         long receivedTimeMillis = System.currentTimeMillis();
         if (header.isEtwsPrimaryNotification()) {
@@ -104,7 +105,7 @@ public class GsmSmsCbMessage {
                     header.getSerialNumber(), location, header.getServiceCategory(), null,
                     getEtwsPrimaryMessage(context, header.getEtwsInfo().getWarningType()),
                     SmsCbMessage.MESSAGE_PRIORITY_EMERGENCY, header.getEtwsInfo(),
-                    header.getCmasInfo(), 0, null /* geometries */, receivedTimeMillis);
+                    header.getCmasInfo(), 0, null /* geometries */, receivedTimeMillis, slotIndex);
         } else if (header.isUmtsFormat()) {
             // UMTS format has only 1 PDU
             byte[] pdu = pdus[0];
@@ -138,7 +139,7 @@ public class GsmSmsCbMessage {
                     header.getGeographicalScope(), header.getSerialNumber(), location,
                     header.getServiceCategory(), language, body, priority,
                     header.getEtwsInfo(), header.getCmasInfo(), maximumWaitingTimeSec, geometries,
-                    receivedTimeMillis);
+                    receivedTimeMillis, slotIndex);
         } else {
             String language = null;
             StringBuilder sb = new StringBuilder();
@@ -154,7 +155,7 @@ public class GsmSmsCbMessage {
                     header.getGeographicalScope(), header.getSerialNumber(), location,
                     header.getServiceCategory(), language, sb.toString(), priority,
                     header.getEtwsInfo(), header.getCmasInfo(), 0, null /* geometries */,
-                    receivedTimeMillis);
+                    receivedTimeMillis, slotIndex);
         }
     }