diff --git a/telephony/java/android/telephony/PhoneNumberUtils.java b/telephony/java/android/telephony/PhoneNumberUtils.java
index 183beb1daf50c..5afe56c78e861 100644
--- a/telephony/java/android/telephony/PhoneNumberUtils.java
+++ b/telephony/java/android/telephony/PhoneNumberUtils.java
@@ -1711,6 +1711,13 @@ public class PhoneNumberUtils
             return false;
         }
 
+        // STOPSHIP: remove this after figuring out issue 5914560, 6383850.
+        Log.d(LOG_TAG, "System property doesn't provide any emergency numbers."
+                + " Use embedded logic for determining emergency numbers."
+                + " number: " + toLogSafePhoneNumber(number)
+                + ", Iso: " + defaultCountryIso
+                + ", useExactMatch: " + useExactMatch);
+
         // No ecclist system property, so use our own list.
         if (defaultCountryIso != null) {
             ShortNumberUtil util = new ShortNumberUtil();
@@ -1728,6 +1735,21 @@ public class PhoneNumberUtils
         }
     }
 
+    private static String toLogSafePhoneNumber(String number) {
+        // Do exactly same thing as Uri#toSafeString() does, which will enable us to compare
+        // sanitized phone numbers.
+        StringBuilder builder = new StringBuilder();
+        for (int i = 0; i < number.length(); i++) {
+            char c = number.charAt(i);
+            if (c == '-' || c == '@' || c == '.') {
+                builder.append(c);
+            } else {
+                builder.append('x');
+            }
+        }
+        return builder.toString();
+    }
+
     /**
      * Checks if a given number is an emergency number for the country that the user is in. The
      * current country is determined using the CountryDetector.