diff --git a/telephony/java/android/telephony/euicc/EuiccManager.java b/telephony/java/android/telephony/euicc/EuiccManager.java
index 4820d332de0f6..eede9dc474f86 100644
--- a/telephony/java/android/telephony/euicc/EuiccManager.java
+++ b/telephony/java/android/telephony/euicc/EuiccManager.java
@@ -25,12 +25,14 @@ import android.annotation.SdkConstant;
 import android.annotation.SystemApi;
 import android.app.Activity;
 import android.app.PendingIntent;
+import android.app.compat.CompatChanges;
 import android.compat.annotation.ChangeId;
 import android.compat.annotation.EnabledSince;
 import android.content.Context;
 import android.content.Intent;
 import android.content.IntentSender;
 import android.content.pm.PackageManager;
+import android.os.Binder;
 import android.os.Build;
 import android.os.Bundle;
 import android.os.RemoteException;
@@ -827,6 +829,18 @@ public class EuiccManager {
     @EnabledSince(targetSdkVersion = Build.VERSION_CODES.TIRAMISU)
     public static final long SWITCH_WITHOUT_PORT_INDEX_EXCEPTION_ON_DISABLE = 218393363L;
 
+    /**
+     * With support for MEP(multiple enabled profile) in Android T, a SIM card can enable multiple
+     * profile on different port. If apps are not target SDK T yet and keep calling the
+     * switchToSubscription or download API without specifying the port index, we should
+     * keep the existing behaviour by always use port index 0 even the device itself has MEP eUICC,
+     * this is for carrier app's backward compatibility.
+     * @hide
+     */
+    @ChangeId
+    @EnabledSince(targetSdkVersion = Build.VERSION_CODES.TIRAMISU)
+    public static final long SHOULD_RESOLVE_PORT_INDEX_FOR_APPS = 224562872L;
+
     private final Context mContext;
     private int mCardId;
 
@@ -1165,7 +1179,8 @@ public class EuiccManager {
      * subscription on the eUICC and the platform will internally resolve a port based on following
      * rules:
      * <ul>
-     *    <li>always use the default port 0 is eUICC does not support MEP.
+     *    <li>always use the default port 0 is eUICC does not support MEP or the apps are
+     *    not targeting on Android T.
      *    <li>In SS(Single SIM) mode, if the embedded slot already has an active port, then enable
      *    the subscription on this port.
      *    <li>In SS mode, if the embedded slot is not active, then try to enable the subscription on