Lower severity of warnings for messages that are less important to clients.

cpp/src/phonenumbers/phonenumberutil.cc

@@ -1061,9 +1061,8 @@ void PhoneNumberUtil::FormatOutOfCountryCallingNumber(
     string* formatted_number) const {
   DCHECK(formatted_number);
   if (!IsValidRegionCode(calling_from)) {
-    LOG(WARNING) << "Trying to format number from invalid region "
-                 << calling_from
-                 << ". International formatting applied.";
+    VLOG(1) << "Trying to format number from invalid region " << calling_from
+            << ". International formatting applied.";
     Format(number, INTERNATIONAL, formatted_number);
     return;
   }
@@ -1377,9 +1376,10 @@ void PhoneNumberUtil::FormatOutOfCountryKeepingAlphaChars(
     // Invalid region entered as country-calling-from (so no metadata was found
     // for it) or the region chosen has multiple international dialling
     // prefixes.
-    LOG(WARNING) << "Trying to format number from invalid region "
-                 << calling_from
-                 << ". International formatting applied.";
+    if (!IsValidRegionCode(calling_from)) {
+      VLOG(1) << "Trying to format number from invalid region " << calling_from
+              << ". International formatting applied.";
+    }
     formatted_number->assign(raw_input_copy);
     PrefixNumberWithCountryCallingCode(country_code, INTERNATIONAL,
                                        formatted_number);

java/libphonenumber/src/com/google/i18n/phonenumbers/PhoneNumberUtil.java

@@ -1639,10 +1639,12 @@ public class PhoneNumberUtil {
     } else {
       // Invalid region entered as country-calling-from (so no metadata was found for it) or the
       // region chosen has multiple international dialling prefixes.
-      logger.log(Level.WARNING,
-                 "Trying to format number from invalid region "
-                 + regionCallingFrom
-                 + ". International formatting applied.");
+      if (!isValidRegionCode(regionCallingFrom)) {
+        logger.log(Level.WARNING,
+                   "Trying to format number from invalid region "
+                   + regionCallingFrom
+                   + ". International formatting applied.");
+      }
       prefixNumberWithCountryCallingCode(countryCode,
                                          PhoneNumberFormat.INTERNATIONAL,
                                          formattedNumber);