Within 12 hours after admission, the respondent shall be given a copy of the petition and an explanation of his hearing rights under Article VI of this Chapter. Within 24 hours after admission, excluding Saturdays, Sundays and holidays, a copy of the petition shall be given personally or mailed to the persons specified in Section 4-206. The respondent shall be allowed to complete no fewer than 2 telephone calls at the time of his admission to such persons as he chooses.