The problem with blocking specific numbers as they come through is that many scammers simply spoof assorted numbers and don't necessarily use the same one over and over again. We have a BT premium phone, which if it does not recognise the incoming number from the contacts you have entered, asks the caller to identify themselves and press #, before the phone will ring. Since most of these scammers are using some sort of autodialling system, they cannot cope with this and just don't get through. Their number does come up on your display when you next lift your phone, so you can check in case it is a number you recognise, and anyway genuine callers will normally follow the instructions. Drawback, the phones were not cheap, now possibly over £100 for a set of three, but at the time we got them, our existing phones were acting up so needed replaced anyway.