diff --git a/telephony/java/android/telephony/CarrierConfigManager.java b/telephony/java/android/telephony/CarrierConfigManager.java
index 5081c25f2003d..c6cb61d4fd323 100644
--- a/telephony/java/android/telephony/CarrierConfigManager.java
+++ b/telephony/java/android/telephony/CarrierConfigManager.java
@@ -660,6 +660,13 @@ public class CarrierConfigManager {
      */
     public static final String KEY_ALLOW_ADDING_APNS_BOOL = "allow_adding_apns_bool";
 
+    /**
+     * APN types that user is not allowed to modify
+     * @hide
+     */
+    public static final String KEY_READ_ONLY_APN_TYPES_STRING_ARRAY =
+            "read_only_apn_types_string_array";
+
     /**
      * Boolean indicating if intent for emergency call state changes should be broadcast
      * @hide
@@ -1012,6 +1019,7 @@ public class CarrierConfigManager {
         sDefaults.putString(KEY_CI_ACTION_ON_SYS_UPDATE_EXTRA_VAL_STRING, "");
         sDefaults.putBoolean(KEY_CSP_ENABLED_BOOL, false);
         sDefaults.putBoolean(KEY_ALLOW_ADDING_APNS_BOOL, true);
+        sDefaults.putStringArray(KEY_READ_ONLY_APN_TYPES_STRING_ARRAY, null);
         sDefaults.putBoolean(KEY_BROADCAST_EMERGENCY_CALL_STATE_CHANGES_BOOL, false);
         sDefaults.putBoolean(KEY_ALWAYS_SHOW_EMERGENCY_ALERT_ONOFF_BOOL, false);
         sDefaults.putBoolean(KEY_DISABLE_SEVERE_WHEN_EXTREME_DISABLED_BOOL, true);
diff --git a/telephony/java/com/android/internal/telephony/PhoneConstants.java b/telephony/java/com/android/internal/telephony/PhoneConstants.java
index b417a1c9e206b..fdc68b9fb7c62 100644
--- a/telephony/java/com/android/internal/telephony/PhoneConstants.java
+++ b/telephony/java/com/android/internal/telephony/PhoneConstants.java
@@ -140,6 +140,18 @@ public class PhoneConstants {
     /** APN type for Emergency PDN. This is not an IA apn, but is used
      * for access to carrier services in an emergency call situation. */
     public static final String APN_TYPE_EMERGENCY = "emergency";
+    /** Array of all APN types */
+    public static final String[] APN_TYPES = {APN_TYPE_DEFAULT,
+            APN_TYPE_MMS,
+            APN_TYPE_SUPL,
+            APN_TYPE_DUN,
+            APN_TYPE_HIPRI,
+            APN_TYPE_FOTA,
+            APN_TYPE_IMS,
+            APN_TYPE_CBS,
+            APN_TYPE_IA,
+            APN_TYPE_EMERGENCY
+    };
 
     public static final int RIL_CARD_MAX_APPS    = 8;