Exactly, If your provider can't be certain that the number is real (i.e. they generated it themselves or it came from a trusted/liable source) then they shouldn

Exactly, If your provider can't be certain that the number is real (i.e. they generated it themselves or it came from a trusted/liable source) then they shouldn't be charging for it and held liable if they allow a spoofed number for fraud. Maybe that would be the mean the end of caller-ID and associated fees, but if I'm not sure that it's useful today with the level of spam. If someone spoofs your ph# to make 5000 spam calls, I guarantee it's not useful to you. Find another in/out of band way of providing caller-ID services.