Different types of call blocking technology are to be installed in the homes of vulnerable residents in East Renfrewshire, Angus and East Dunbartonshire.
The pilot study is the latest initiative employed by the councils who have trading standards teams with similar prevention based approaches to tackling cold callers.
East Renfrewshire residents either trialled the True Call Care unit or the CPR call blocker. The feedback from was extremely positive.
Paul Holland, senior trading standards officer, at East Renfrewshire Council, said: "With appropriate funding, we would like to extend the trial to protect residents, particularly those dealing with the challenges of dementia."