diff --git a/src/com/android/phone/PhoneInterfaceManager.java b/src/com/android/phone/PhoneInterfaceManager.java
index 99113bf..c6723a4 100755
--- a/src/com/android/phone/PhoneInterfaceManager.java
+++ b/src/com/android/phone/PhoneInterfaceManager.java
@@ -8307,6 +8307,11 @@
         //TODO investigate if this API should require proper permission check in R b/133791609
         final long identity = Binder.clearCallingIdentity();
         try {
+            String carrierUAProfUrl = mApp.getCarrierConfigForSubId(subId).getString(
+                    CarrierConfigManager.KEY_MMS_UA_PROF_URL_STRING);
+            if (!TextUtils.isEmpty(carrierUAProfUrl)) {
+                return carrierUAProfUrl;
+            }
             return SubscriptionManager.getResourcesForSubId(getDefaultPhone().getContext(), subId)
                     .getString(com.android.internal.R.string.config_mms_user_agent_profile_url);
         } finally {
@@ -8319,6 +8324,11 @@
         //TODO investigate if this API should require proper permission check in R b/133791609
         final long identity = Binder.clearCallingIdentity();
         try {
+            String carrierUserAgent = mApp.getCarrierConfigForSubId(subId).getString(
+                    CarrierConfigManager.KEY_MMS_USER_AGENT_STRING);
+            if (!TextUtils.isEmpty(carrierUserAgent)) {
+                return carrierUserAgent;
+            }
             return SubscriptionManager.getResourcesForSubId(getDefaultPhone().getContext(), subId)
                     .getString(com.android.internal.R.string.config_mms_user_agent);
         } finally {