Hi CherryNWhite There are phones that offer this option. I have one but it is a bit over complicated. I do not think it is as good as the one I got for my mother - a BT 4000. From memory it had the option to block withheld numbers, international numbers and out of area numbers. Plus the usual options to block numbers you do not know.
will Virgin be introducing a service like BTs 1572 option? We are being plagued by nuisance calls from Benefits UK with random numbers showing, I have blocked many of these but the still call with a new number showing, we know they tried ten times in one day