Shortcodes disappearing with Visual Composer

Hi,
I’m testing a workaround;
In functions.php, add this code;

function phone_before_after($content) {
  $phoneFromHere="[vc_row][vc_column width=\"1/1\" el_class=\"phonefromhere\"][/vc_column][/vc_row]";
  if (strpos($content, $phoneFromHere) !== false) {
    $content = str_replace($phoneFromHere, "[/notphone][phone]", $content);
    $beforecontent = "[notphone]";
    $aftercontent = "[/phone]";
    $fullcontent = $beforecontent . $content . $aftercontent;
  }else{
    $fullcontent=$content;
  }
  return $fullcontent;
}
add_filter("the_content", "phone_before_after");

in Visual Composer;
I add the default content first, then at the end, an empty row where I add the class “phonefromhere” to the empty column.
[edit]: And after this empty row, I add the part meant for phones.

This way I get [notphone][/notphone] on the first part, and [phone][/phone] on the last part of the page.