Elisa, Telia and Tele2 are using a new system.
The system blocks calls with fake numbers.
But scam calls are not decreasing.
Scammers also use other numbers.
Tele2's system was ready in November.
It does not block all scam calls.
Scammers always find new ways.
All operators should use the system.
In Estonia, telecoms do their own security work.
In Finland, the system works well.
Elisa blocks many scam calls there.
Elisa also fights against text message scams.