Re: it could divert 1.6 billion nuisance calls a year.
"For consumers with no call bundle with BT, maybe."
Perhaps someone needs to explain how interconnect charges work. BT get paid for terminating calls originating from other telcos (and vice versa).
One of the reasons that telcos started paying attention to scam calls was because of fraudulent accounting data getting injected into the network resulting in them not being paid for the calls.