diff --git a/telephony/java/android/telephony/TelephonyManager.java b/telephony/java/android/telephony/TelephonyManager.java
index c574fb4d66056..e7361ef665318 100644
--- a/telephony/java/android/telephony/TelephonyManager.java
+++ b/telephony/java/android/telephony/TelephonyManager.java
@@ -7581,6 +7581,9 @@ public class TelephonyManager {
     @SystemApi
     @RequiresPermission(android.Manifest.permission.MODIFY_PHONE_STATE)
     public int setAllowedCarriers(int slotIndex, List<CarrierIdentifier> carriers) {
+        if (!SubscriptionManager.isValidPhoneId(slotIndex)) {
+            return -1;
+        }
         try {
             ITelephony service = getITelephony();
             if (service != null) {
@@ -7608,15 +7611,17 @@ public class TelephonyManager {
     @SystemApi
     @RequiresPermission(android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE)
     public List<CarrierIdentifier> getAllowedCarriers(int slotIndex) {
-        try {
-            ITelephony service = getITelephony();
-            if (service != null) {
-                return service.getAllowedCarriers(slotIndex);
+        if (SubscriptionManager.isValidPhoneId(slotIndex)) {
+            try {
+                ITelephony service = getITelephony();
+                if (service != null) {
+                    return service.getAllowedCarriers(slotIndex);
+                }
+            } catch (RemoteException e) {
+                Log.e(TAG, "Error calling ITelephony#getAllowedCarriers", e);
+            } catch (NullPointerException e) {
+                Log.e(TAG, "Error calling ITelephony#getAllowedCarriers", e);
             }
-        } catch (RemoteException e) {
-            Log.e(TAG, "Error calling ITelephony#getAllowedCarriers", e);
-        } catch (NullPointerException e) {
-            Log.e(TAG, "Error calling ITelephony#getAllowedCarriers", e);
         }
         return new ArrayList<CarrierIdentifier>(0);
     }