public void setSortByPhoneNumber(boolean sort) {
		if (!sortByPhoneNumber) {
			Collections.sort(listPhoneBook, new SortedByPhoneNumber());
			sortByPhoneNumber = true;
		} else {
			Collections.sort(listPhoneBook,
					Collections.reverseOrder(new SortedByPhoneNumber()));
			sortByPhoneNumber = false;
		}
	}