diff --git a/telephony/java/android/telephony/PhoneCapability.java b/telephony/java/android/telephony/PhoneCapability.java
index 21dad77d29b76..c1906ebeec9fa 100644
--- a/telephony/java/android/telephony/PhoneCapability.java
+++ b/telephony/java/android/telephony/PhoneCapability.java
@@ -30,6 +30,25 @@ import java.util.Objects;
  * @hide
  */
 public class PhoneCapability implements Parcelable {
+    // Hardcoded default DSDS capability.
+    public static final PhoneCapability DEFAULT_DSDS_CAPABILITY;
+    // Hardcoded default Single SIM single standby capability.
+    public static final PhoneCapability DEFAULT_SSSS_CAPABILITY;
+
+    static {
+        ModemInfo modemInfo1 = new ModemInfo(0, 0, true, true);
+        ModemInfo modemInfo2 = new ModemInfo(1, 0, true, true);
+
+        List<ModemInfo> logicalModemList = new ArrayList<>();
+        logicalModemList.add(modemInfo1);
+        logicalModemList.add(modemInfo2);
+        DEFAULT_DSDS_CAPABILITY = new PhoneCapability(1, 1, 0, logicalModemList, false);
+
+        logicalModemList = new ArrayList<>();
+        logicalModemList.add(modemInfo1);
+        DEFAULT_SSSS_CAPABILITY = new PhoneCapability(1, 1, 0, logicalModemList, false);
+    }
+
     public final int maxActiveVoiceCalls;
     public final int maxActiveData;
     public final int max5G;
diff --git a/telephony/java/android/telephony/SubscriptionManager.java b/telephony/java/android/telephony/SubscriptionManager.java
index 1f9f32df83c7d..801f93777d4e8 100644
--- a/telephony/java/android/telephony/SubscriptionManager.java
+++ b/telephony/java/android/telephony/SubscriptionManager.java
@@ -2588,8 +2588,7 @@ public class SubscriptionManager {
      *              {@link NetworkCapabilities#NET_CAPABILITY_VALIDATED}.
      * @param executor The executor of where the callback will execute.
      * @param callback Callback will be triggered once it succeeds or failed.
-     *                 See {@link TelephonyManager.SetOpportunisticSubscriptionResult}
-     *                 for more details. Pass null if don't care about the result.
+     *                 Pass null if don't care about the result.
      *
      * @hide
      *
@@ -2597,7 +2596,8 @@ public class SubscriptionManager {
     @SystemApi
     @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
     public void setPreferredDataSubscriptionId(int subId, boolean needValidation,
-            @Nullable @CallbackExecutor Executor executor, @Nullable  Consumer<Integer> callback) {
+            @Nullable @CallbackExecutor Executor executor, @Nullable
+            @TelephonyManager.SetOpportunisticSubscriptionResult Consumer<Integer> callback) {
         if (VDBG) logd("[setPreferredDataSubscriptionId]+ subId:" + subId);
         try {
             ISub iSub = ISub.Stub.asInterface(ServiceManager.getService("isub"));
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index b83008fd9a29f..615138d66593e 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -10712,6 +10712,25 @@ public class TelephonyManager {
         return ret;
     }
 
+    /**
+     * It indicates whether modem is enabled or not per slot.
+     * It's the corresponding status of {@link #enableModemForSlot}.
+     *
+     * @param slotIndex which slot it's checking.
+     * @hide
+     */
+    public boolean isModemEnabledForSlot(int slotIndex) {
+        try {
+            ITelephony telephony = getITelephony();
+            if (telephony != null) {
+                return telephony.isModemEnabledForSlot(slotIndex, mContext.getOpPackageName());
+            }
+        } catch (RemoteException ex) {
+            Log.e(TAG, "enableModem RemoteException", ex);
+        }
+        return false;
+    }
+
     /**
      * Indicate if the user is allowed to use multiple SIM cards at the same time to register
      * on the network (e.g. Dual Standby or Dual Active) when the device supports it, or if the
diff --git a/telephony/java/com/android/internal/telephony/ITelephony.aidl b/telephony/java/com/android/internal/telephony/ITelephony.aidl
index 6f37b7f8309ca..b5e7f8267ee51 100644
--- a/telephony/java/com/android/internal/telephony/ITelephony.aidl
+++ b/telephony/java/com/android/internal/telephony/ITelephony.aidl
@@ -1963,5 +1963,7 @@ interface ITelephony {
     /**
      * Get the IRadio HAL Version encoded as 100 * MAJOR_VERSION + MINOR_VERSION or -1 if unknown
      */
-     int getRadioHalVersion();
+    int getRadioHalVersion();
+
+    boolean isModemEnabledForSlot(int slotIndex, String callingPackage);
 }