Nevermind, I've found it myself in this post (see last bust one post).FYI here are my changes (fyi; phone numbers need 3 digits, mobile phone 10)staff.inc.php <td><?php echo __('Phone Number');?>:</td> <td> <input type="tel" size="3" name="phone" class="auto phone" value="<?php echo Format:($staff->phone); ?>" /> <?php echo __('Ext');?> (bold originally 18)& <td> <input type="tel" size="10" name="mobile" class="auto phone" value="<?php echo Format:($staff->mobile); ?>" /> <div class="error"><?php echo $errors; ?></div> </td>(bold originally 18)my class.validator.php: static function is_phone($phone) { /* We're not really validating the phone number but just making sure it doesn't contain illegal chars and of acceptable len */ $stripped=preg_replace("(\(|\)|\-|\.|\+|+)","",$phone); return (!is_numeric($stripped) || ((strlen($stripped)<3) || (strlen($stripped)>10)))?false;the values in bold were 7 & 16 respectivelyonly annoyance, mobile phone number is formated as (123) 456-789 as we use format 123/45 67 89How can I change this?kr,wouter