Scammers are getting more and more sophisticated now a days. It seems like most of these scam calls are a result of the ability to spoof phone numbers. Spoofing phone numbers does have legitimate purposes (for example a phone number from a customer service company is able to use their company phone number as the caller ID) but these scammers seem to abuse this. It's quite similar to how SMTP for emails allows the "Fr…
(which seems a US focused initiative, which I guess makes sense as the problem seems much worse there than in other countries... but I wonder if that means that you guys will be getting lots of robocalls from unknown foreign numbers in the future ;)