First thing to do would be to change the format to that, and remove the extra 'x' at the beginning:
'(xxxx) xxxx-xxxx'
Next you will have to go to the top of the page and find this code:
$WAFV_Errors .= WAValidatePN(((isset($_POST["OrderPhone"]))?$_POST["OrderPhone"]:"") . "",true,false,true,8);
Change the false to a true.
Then go to the WA_ValidationToolkit directory and open the WAVT_Scripts_PHP.php file and find the function:
function WAValidatePN($value,$areaCode,$international,$required,$number) {
In this function you will want to find this block of code:
if ($international) {
if (strlen($newVal) < 5) {
$isValid = false;
}
}
Change the condition:
strlen($newVal) < 5
to look like this:
strlen($newVal) != 12