Correctly handle undefined carrier. #97

lib/text.js

@@ -34,7 +34,7 @@ function sendText(phone, message, carrier, region, cb) {
   region = region || 'us';
 
   var providers_list;
-  if (carrier !== null) {
+  if (carrier) {
     providers_list = carriers[carrier];
   } else {
     providers_list = providers[region];