After the restaurant waiter or cook is done texting and then flushes the toilet, they wash their hands. Do they wash their phone? Or do they put phone in pocket

After the restaurant waiter or cook is done texting and then flushes the toilet, they wash their hands. Do they wash their phone? Or do they put phone in pocket, go back to kitchen, and proceed to finger the phone for the next hour and contaminate everything while playing their role wearing a mask?