diff --git a/src/com/android/services/telephony/ConferenceParticipantConnection.java b/src/com/android/services/telephony/ConferenceParticipantConnection.java
index 1f330f9..6d2e982 100644
--- a/src/com/android/services/telephony/ConferenceParticipantConnection.java
+++ b/src/com/android/services/telephony/ConferenceParticipantConnection.java
@@ -231,7 +231,7 @@
         SubscriptionInfo subInfo = TelecomAccountRegistry.getInstance(null).
                 getSubscriptionManager().getActiveSubscriptionInfo(subId);
 
-        if (subInfo == null) {
+        if (subInfo == null || TextUtils.isEmpty(subInfo.getCountryIso())) {
             return null;
         }
         // The SubscriptionInfo reports ISO country codes in lower case.  Convert to upper case,