diff --git a/src/com/android/phone/CarrierConfigLoader.java b/src/com/android/phone/CarrierConfigLoader.java
index d451ccf..49f690a 100644
--- a/src/com/android/phone/CarrierConfigLoader.java
+++ b/src/com/android/phone/CarrierConfigLoader.java
@@ -1091,6 +1091,9 @@
 
     @Override
     public String getDefaultCarrierServicePackageName() {
+        mContext.enforceCallingOrSelfPermission(
+                android.Manifest.permission.READ_PRIVILEGED_PHONE_STATE,
+                "getDefaultCarrierServicePackageName");
         return mPlatformCarrierConfigPackage;
     }