Re: Ofcom is to blame
Agreed, Caller Display isn't a magic bullet, but call blocking hardware won't work without it. Anonymous Call Reject is almost a magic bullet because it blocks many unwanted calls without requiring expensive hardware.
The point I'm making is that victims need all the help they can get to block and report fraudulent / nuisance calls, but Ofcom and the ICO are just a waste of space. They shouldn't allow telcos to blackmail vulnerable telephone users into buying expensive network services that cost the telcos nothing to provide.
It's daft that the health service withholds numbers on data protection grounds: when they send letters, the envelope shows the patient's name and shouts NHS all over it, so they clearly haven't thought it through.
To avoid having calls rejected, they should follow BT's good practice and use a Presentation Number that when called says "The NHS tried to call you, but don't worry, we'll call again if necessary". Or if they're really concerned about privacy, it could just say "We tried to call you..." or "Sorry, this number does not accept incoming calls".