Feeds remove item with certainly conditions
To alter the source items for the D7 version of Feeds, implement the hook hook_feeds_after_parse().

/**
 * Implements hook_feeds_after_parse().
 *
 * Removes duplicate phone numbers for importer 'myimporter'.
 */
function mymodule_feeds_after_parse($source, $result) {
  if ($source-&gt;importer-&gt;id == 'myimporter') {
    foreach ($result-&gt;items as &amp;$item) {
      if (isset($item['phone 1']) &amp;&amp; isset($item['phone 2']) &amp;&amp; $item['phone 1'] == $item['phone 2']) {
        // If phone 1 and phone 2 are the same, do not import phone 2.
        unset($item['phone 2']);
      }
    }
  }
}