Final answer:
The responsibility for maintaining an updated phone list for the hosts/hostesses usually lies with the managerial staff or administrative team, ensuring smooth business operations and excellent customer service.
Step-by-step explanation:
The responsibility for keeping an updated phone list for the hosts/hostesses typically falls on the managerial staff or the administrative team of the restaurant or hospitality establishment.
The management has the duty to ensure that all communication channels, including phone lists, are current and accurately maintained.
This is crucial for the smooth operation of the business and for providing excellent customer service. In some cases, the host or hostess may also play a part in updating this information, but it ultimately depends on the organizational structure of the establishment.