diff --git a/telephony/java/android/provider/Telephony.java b/telephony/java/android/provider/Telephony.java
index 72f0292..7b798e8 100644
--- a/telephony/java/android/provider/Telephony.java
+++ b/telephony/java/android/provider/Telephony.java
@@ -3497,6 +3497,27 @@
         }
 
         /**
+         * Generates a content {@link Uri} used to receive updates on precise carrier identity
+         * change on the given subscriptionId
+         * {@link TelephonyManager#ACTION_SUBSCRIPTION_PRECISE_CARRIER_IDENTITY_CHANGED}.
+         * <p>
+         * Use this {@link Uri} with a {@link ContentObserver} to be notified of changes to the
+         * precise carrier identity {@link TelephonyManager#getSimPreciseCarrierId()}
+         * while your app is running. You can also use a {@link JobService} to ensure your app
+         * is notified of changes to the {@link Uri} even when it is not running.
+         * Note, however, that using a {@link JobService} does not guarantee timely delivery of
+         * updates to the {@link Uri}.
+         *
+         * @param subscriptionId the subscriptionId to receive updates on
+         * @return the Uri used to observe precise carrier identity changes
+         * @hide
+         */
+        public static Uri getPreciseCarrierIdUriForSubscriptionId(int subscriptionId) {
+            return Uri.withAppendedPath(Uri.withAppendedPath(CONTENT_URI, "precise"),
+                    String.valueOf(subscriptionId));
+        }
+
+        /**
          * A user facing carrier name.
          * @see TelephonyManager#getSimCarrierIdName()
          * <P>Type: TEXT </P>
@@ -3511,6 +3532,35 @@
         public static final String CARRIER_ID = "carrier_id";
 
         /**
+         * A user facing carrier name for precise carrier id.
+         * @see TelephonyManager#getSimPreciseCarrierIdName()
+         * This is not a database column, only used to notify content observers for
+         * {@link #getPreciseCarrierIdUriForSubscriptionId(int)}
+         * @hide
+         */
+        public static final String PRECISE_CARRIER_ID_NAME = "precise_carrier_id_name";
+
+        /**
+         * A fine-grained carrier id.
+         * @see TelephonyManager#getSimPreciseCarrierId()
+         * This is not a database column, only used to notify content observers for
+         * {@link #getPreciseCarrierIdUriForSubscriptionId(int)}
+         * @hide
+         */
+        public static final String PRECISE_CARRIER_ID = "precise_carrier_id";
+
+        /**
+         * A unique parent carrier id. The parent-child
+         * relationship can be used to further differentiate a single carrier by different networks,
+         * by prepaid v.s. postpaid or even by 4G v.s. 3G plan. It's an optional field.
+         * A carrier id with a valid parent_carrier_id is considered fine-grained carrier id, will
+         * not be returned as {@link #CARRIER_ID} but {@link #PRECISE_CARRIER_ID}.
+         * <P>Type: INTEGER </P>
+         * @hide
+         */
+        public static final String PARENT_CARRIER_ID = "parent_carrier_id";
+
+        /**
          * A unique mno carrier id. mno carrier shares the same {@link All#MCCMNC} as carrier id
          * and can be solely identified by {@link All#MCCMNC} only. If there is no such mno
          * carrier, then mno carrier id equals to {@link #CARRIER_ID carrier id}.
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index 5f69507..016a77d 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -1212,6 +1212,33 @@
             "android.telephony.action.SUBSCRIPTION_CARRIER_IDENTITY_CHANGED";
 
     /**
+     * Broadcast Action: The subscription precise carrier identity has changed.
+     * Similar like {@link #ACTION_SUBSCRIPTION_CARRIER_IDENTITY_CHANGED}, this intent will be sent
+     * on the event of {@link #ACTION_SUBSCRIPTION_CARRIER_IDENTITY_CHANGED}. However, its possible
+     * that precise carrier identity changes while
+     * {@link #ACTION_SUBSCRIPTION_CARRIER_IDENTITY_CHANGED} remains the same e.g, the same
+     * subscription switches to different IMSI could potentially change its precise carrier id.
+     *
+     * The intent will have the following extra values:
+     * <ul>
+     *   <li>{@link #EXTRA_PRECISE_CARRIER_ID} The up-to-date precise carrier id of the
+     *   current subscription.
+     *   </li>
+     *   <li>{@link #EXTRA_PRECISE_CARRIER_NAME} The up-to-date carrier name of the current
+     *   subscription.
+     *   </li>
+     *   <li>{@link #EXTRA_SUBSCRIPTION_ID} The subscription id associated with the changed carrier
+     *   identity.
+     *   </li>
+     * </ul>
+     * <p class="note">This is a protected intent that can only be sent by the system.
+     * @hide
+     */
+    @SdkConstant(SdkConstantType.BROADCAST_INTENT_ACTION)
+    public static final String ACTION_SUBSCRIPTION_PRECISE_CARRIER_IDENTITY_CHANGED =
+            "android.telephony.action.SUBSCRIPTION_PRECISE_CARRIER_IDENTITY_CHANGED";
+
+    /**
      * An int extra used with {@link #ACTION_SUBSCRIPTION_CARRIER_IDENTITY_CHANGED} which indicates
      * the updated carrier id {@link TelephonyManager#getSimCarrierId()} of
      * the current subscription.
@@ -1240,6 +1267,28 @@
     public static final String EXTRA_CARRIER_NAME = "android.telephony.extra.CARRIER_NAME";
 
     /**
+     * An int extra used with {@link #ACTION_SUBSCRIPTION_PRECISE_CARRIER_IDENTITY_CHANGED} which
+     * indicates the updated precise carrier id {@link TelephonyManager#getSimPreciseCarrierId()} of
+     * the current subscription. Note, its possible precise carrier id changes while
+     * {@link #ACTION_SUBSCRIPTION_CARRIER_IDENTITY_CHANGED} remains the same e.g, when
+     * subscription switch to different IMSI.
+     * <p>Will be {@link TelephonyManager#UNKNOWN_CARRIER_ID} if the subscription is unavailable or
+     * the carrier cannot be identified.
+     * @hide
+     */
+    public static final String EXTRA_PRECISE_CARRIER_ID =
+            "android.telephony.extra.PRECISE_CARRIER_ID";
+
+    /**
+     * An string extra used with {@link #ACTION_SUBSCRIPTION_PRECISE_CARRIER_IDENTITY_CHANGED} which
+     * indicates the updated precise carrier name of the current subscription.
+     * {@see TelephonyManager#getSimPreciseCarrierIdName()}
+     * <p>it's a user-facing name of the precise carrier id {@link #EXTRA_PRECISE_CARRIER_ID},
+     * @hide
+     */
+    public static final String EXTRA_PRECISE_CARRIER_NAME = "android.telephony.extra.CARRIER_NAME";
+
+    /**
      * An int extra used with {@link #ACTION_SUBSCRIPTION_CARRIER_IDENTITY_CHANGED} to indicate the
      * subscription which has changed.
      */
@@ -8299,6 +8348,62 @@
     }
 
     /**
+     * Returns fine-grained carrier id of the current subscription.
+     *
+     * <p>The precise carrier id can be used to further differentiate a carrier by different
+     * networks, by prepaid v.s.postpaid or even by 4G v.s.3G plan. Each carrier has a unique
+     * carrier id {@link #getSimCarrierId()} but can have multiple precise carrier id. e.g,
+     * {@link #getSimCarrierId()} will always return Tracfone (id 2022) for a Tracfone SIM, while
+     * {@link #getSimPreciseCarrierId()} can return Tracfone AT&T or Tracfone T-Mobile based on the
+     * current subscription IMSI.
+     *
+     * <p>For carriers without any fine-grained carrier ids, return {@link #getSimCarrierId()}
+     * <p>Precise carrier ids are defined in the same way as carrier id
+     * <a href="https://android.googlesource.com/platform/packages/providers/TelephonyProvider/+/master/assets/carrier_list.textpb">here</a>
+     * except each with a "parent" id linking to its top-level carrier id.
+     *
+     * @return Returns fine-grained carrier id of the current subscription.
+     * Return {@link #UNKNOWN_CARRIER_ID} if the subscription is unavailable or the carrier cannot
+     * be identified.
+     *
+     * @hide
+     */
+    public int getSimPreciseCarrierId() {
+        try {
+            ITelephony service = getITelephony();
+            if (service != null) {
+                return service.getSubscriptionPreciseCarrierId(getSubId());
+            }
+        } catch (RemoteException ex) {
+            // This could happen if binder process crashes.
+        }
+        return UNKNOWN_CARRIER_ID;
+    }
+
+    /**
+     * Similar like {@link #getSimCarrierIdName()}, returns user-facing name of the
+     * precise carrier id {@link #getSimPreciseCarrierId()}
+     *
+     * <p>The returned name is unlocalized.
+     *
+     * @return user-facing name of the subscription precise carrier id. Return {@code null} if the
+     * subscription is unavailable or the carrier cannot be identified.
+     *
+     * @hide
+     */
+    public CharSequence getSimPreciseCarrierIdName() {
+        try {
+            ITelephony service = getITelephony();
+            if (service != null) {
+                return service.getSubscriptionPreciseCarrierName(getSubId());
+            }
+        } catch (RemoteException ex) {
+            // This could happen if binder process crashes.
+        }
+        return null;
+    }
+
+    /**
      * Return a list of certs in hex string from loaded carrier privileges access rules.
      *
      * @return a list of certificate in hex string. return {@code null} if there is no certs
diff --git a/telephony/java/com/android/internal/telephony/ITelephony.aidl b/telephony/java/com/android/internal/telephony/ITelephony.aidl
index cf66ca2..1f37466 100644
--- a/telephony/java/com/android/internal/telephony/ITelephony.aidl
+++ b/telephony/java/com/android/internal/telephony/ITelephony.aidl
@@ -1323,6 +1323,37 @@
     int getSubscriptionMNOCarrierId(int subId);
 
     /**
+     * Returns fine-grained carrier id of the current subscription.
+     *
+     * <p>The precise carrier id can be used to further differentiate a carrier by different
+     * networks, by prepaid v.s.postpaid or even by 4G v.s.3G plan. Each carrier has a unique
+     * carrier id {@link #getSimCarrierId()} but can have multiple precise carrier id. e.g,
+     * {@link #getSimCarrierId()} will always return Tracfone (id 2022) for a Tracfone SIM, while
+     * {@link #getSimPreciseCarrierId()} can return Tracfone AT&T or Tracfone T-Mobile based on the
+     * current underlying network.
+     *
+     * <p>For carriers without any fine-grained carrier ids, return {@link #getSimCarrierId()}
+     *
+     * @return Returns fine-grained carrier id of the current subscription.
+     * Return {@link #UNKNOWN_CARRIER_ID} if the subscription is unavailable or the carrier cannot
+     * be identified.
+     * @hide
+     */
+    int getSubscriptionPreciseCarrierId(int subId);
+
+    /**
+     * Similar like {@link #getSimCarrierIdName()}, returns user-facing name of the
+     * precise carrier id {@link #getSimPreciseCarrierId()}
+     *
+     * <p>The returned name is unlocalized.
+     *
+     * @return user-facing name of the subscription precise carrier id. Return {@code null} if the
+     * subscription is unavailable or the carrier cannot be identified.
+     * @hide
+     */
+    String getSubscriptionPreciseCarrierName(int subId);
+
+    /**
      * Action set from carrier signalling broadcast receivers to enable/disable metered apns
      * Permissions android.Manifest.permission.MODIFY_PHONE_STATE is required
      * @param subId the subscription ID that this action applies to.