The phone number can be provided via an online portal, a telephone enquiry line, or direct to the mobile number of the interviewer for that case.
Gellir darparu'r rhif ffôn drwy borth ar-lein, drwy linell ymholiadau dros y ffôn neu'n uniongyrchol i rif ffôn symudol y cyfwelydd ar gyfer yr achos hwnnw.