Technofreak:

 

alasta:

 

deepred:

 

Here's a list of unsolicited numbers I've received in the last several months alone (links to reverse lookups where available). Who else has gotten calls from them?

 

 

I found that the volume of nuisance calls dropped off to almost zero when I started using the new call screening feature on the iPhone. It seems that time wasters will leave you alone when they discover that you have robust gatekeeping on your phone and there is minimal chance of actually getting you on the line. 

 

 

Samsungs have an alert when a calling number is suspected spam

 

I use Truecaller to identify and tag some of them. When that doesn't suffice, Tellows etc are the next port of call.