There are two locations that you have to change the related code.
The first one inside the function update, and the other inside the function create.
Probably you have just edited in the function update.
Find again this code inside the function create:
$fields = array('type'=>'phone', 'required'=>0, 'error'=>'Valid phone # required');
then replace it with the following:
$fields = array('type'=>'phone', 'required'=>1, 'error'=>'Valid phone # required');
Sincerely,
Masino Sinaga