Customize phone field type to only show AU country

functions.php

<?php
// Add this code to your functions.php file (omit the <?php at the top), or use the Code Snippets plugin (include everything)
add_filter( 'job_manager_field_editor_phone_args', 'smyles_custom_phone_args_only_au' );

function smyles_custom_phone_args_only_au( $args ){
//	Other available arguments, see GitHub for details
//	https://github.com/jackocnr/intl-tel-input/tree/8a2364bc0459fce934d7cf04a82823db63e7944b
//
	$args['nationalMode'] = 'false';
	$args['onlyCountries'] = array( 'au' );
	
	return $args;
}