Scams have been heavily hit in January when the French regulator mandated the telcos to implement a complete block of spoofed phone numbers (it's not an actual hard block, but unauthenticated calls will be market as "private number" which are ignored by most people already).
There will always be scammers who register an actual phone number to run their scams, but this rule will at least stop the constant phone harassment that made everyone unplug their landline phone.
That is really great. I've had a lot of trouble with calls from spoofed numbers a couple of years ago (it ended when I installed a scam blacker on my phone), and when I looked into it at that time, my impression was that phone companies couldn't block spoofed numbers. On the other hand, if the scam blocking app can block them, there clearly must be some way to detect them.
Phone companies need to do a better job protecting their customers against this abuse.