--- phone.module.orig	2008-06-26 16:55:01.000000000 -0400
+++ phone.module	2008-06-27 12:21:55.000000000 -0400
@@ -81,6 +81,16 @@
  */
 function phone_field($op, &$node, $field, &$node_field, $teaser, $page) {
   switch ($op) {
+    case 'submit':
+      // Don't save empty fields (beyond the first one)
+      $save_field = array();
+      foreach ($node_field as $delta => $value) {
+        if (!empty($value['value']) || $delta == 0) {
+          $save_field[] = $node_field[$delta];
+        }
+      }
+      $node_field = $save_field;
+      return;
     case 'view':
       foreach ($node_field as $delta => $item) {
         $node_field[$delta]['view'] = content_format($field, $item, 'default', $node);