diff --git a/api/current.txt b/api/current.txt
index 299700b2dde56..caa14d4f67136 100755
--- a/api/current.txt
+++ b/api/current.txt
@@ -42945,6 +42945,7 @@ package android.telephony {
     method public int getNetworkType();
     method public int getPhoneCount();
     method public int getPhoneType();
+    method public int getPreferredOpportunisticDataSubscription();
     method public android.telephony.ServiceState getServiceState();
     method public android.telephony.SignalStrength getSignalStrength();
     method public int getSimCarrierId();
@@ -42995,6 +42996,7 @@ package android.telephony {
     method public boolean setNetworkSelectionModeManual(java.lang.String, boolean);
     method public boolean setOperatorBrandOverride(java.lang.String);
     method public boolean setPreferredNetworkTypeToGlobal();
+    method public boolean setPreferredOpportunisticDataSubscription(int);
     method public void setVisualVoicemailSmsFilterSettings(android.telephony.VisualVoicemailSmsFilterSettings);
     method public boolean setVoiceMailNumber(java.lang.String, java.lang.String);
     method public deprecated void setVoicemailRingtoneUri(android.telecom.PhoneAccountHandle, android.net.Uri);
diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index 6d1de07e1fb37..a0bfcc36992ff 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -9251,4 +9251,55 @@ public class TelephonyManager {
         }
         return false;
     }
+
+    /**
+     * Set preferred opportunistic data subscription id.
+     *
+     * <p>Requires that the calling app has carrier privileges on both primary and
+     * secondary subscriptions (see
+     * {@link #hasCarrierPrivileges}), or has permission
+     * {@link android.Manifest.permission#MODIFY_PHONE_STATE MODIFY_PHONE_STATE}.
+     *
+     * @param subId which opportunistic subscription
+     * {@link SubscriptionManager#getOpportunisticSubscriptions} is preferred for cellular data.
+     * Pass {@link SubscriptionManager#DEFAULT_SUBSCRIPTION_ID} to unset the preference
+     * @return true if request is accepted, else false.
+     *
+     */
+    public boolean setPreferredOpportunisticDataSubscription(int subId) {
+        String pkgForDebug = mContext != null ? mContext.getOpPackageName() : "<unknown>";
+        try {
+            IAns iAlternativeNetworkService = getIAns();
+            if (iAlternativeNetworkService != null) {
+                return iAlternativeNetworkService.setPreferredData(subId, pkgForDebug);
+            }
+        } catch (RemoteException ex) {
+            Rlog.e(TAG, "setPreferredData RemoteException", ex);
+        }
+        return false;
+    }
+
+    /**
+     * Get preferred opportunistic data subscription Id
+     *
+     * <p>Requires that the calling app has carrier privileges (see {@link #hasCarrierPrivileges}),
+     * or has permission {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}.
+     * @return subId preferred opportunistic subscription id or
+     * {@link SubscriptionManager#DEFAULT_SUBSCRIPTION_ID} if there are no preferred
+     * subscription id
+     *
+     */
+    public int getPreferredOpportunisticDataSubscription() {
+        String pkgForDebug = mContext != null ? mContext.getOpPackageName() : "<unknown>";
+        int subId = SubscriptionManager.INVALID_SUBSCRIPTION_ID;
+        try {
+            IAns iAlternativeNetworkService = getIAns();
+            if (iAlternativeNetworkService != null) {
+                subId = iAlternativeNetworkService.getPreferredData(pkgForDebug);
+            }
+        } catch (RemoteException ex) {
+            Rlog.e(TAG, "getPreferredData RemoteException", ex);
+        }
+        return subId;
+    }
 }
diff --git a/telephony/java/com/android/internal/telephony/IAns.aidl b/telephony/java/com/android/internal/telephony/IAns.aidl
index 6eb8d666cb1e1..e9a46491522e0 100755
--- a/telephony/java/com/android/internal/telephony/IAns.aidl
+++ b/telephony/java/com/android/internal/telephony/IAns.aidl
@@ -49,4 +49,33 @@ interface IAns {
     * @param callingPackage caller's package name
     */
     boolean isEnabled(String callingPackage);
+
+    /**
+     * Set preferred opportunistic data subscription id.
+     *
+     * <p>Requires that the calling app has carrier privileges on both primary and
+     * secondary subscriptions (see
+     * {@link #hasCarrierPrivileges}), or has permission
+     * {@link android.Manifest.permission#MODIFY_PHONE_STATE MODIFY_PHONE_STATE}.
+     *
+     * @param subId which opportunistic subscription
+     * {@link SubscriptionManager#getOpportunisticSubscriptions} is preferred for cellular data.
+     * Pass {@link SubscriptionManager#DEFAULT_SUBSCRIPTION_ID} to unset the preference
+     * @param callingPackage caller's package name
+     * @return true if request is accepted, else false.
+     *
+     */
+    boolean setPreferredData(int subId, String callingPackage);
+
+    /**
+     * Get preferred opportunistic data subscription Id
+     *
+     * <p>Requires that the calling app has carrier privileges (see {@link #hasCarrierPrivileges}),
+     * or has permission {@link android.Manifest.permission#READ_PHONE_STATE READ_PHONE_STATE}.
+     * @return subId preferred opportunistic subscription id or
+     * {@link SubscriptionManager#DEFAULT_SUBSCRIPTION_ID} if there are no preferred
+     * subscription id
+     *
+     */
+    int getPreferredData(String callingPackage);
 }