It's only very few countries where the receiver pays [part of] the cost of the call: USA, Canada, Hong Kong, Singapore.
I get about one spam call per year in Denmark, and my work number is listed on the company website. However, I doubt it's only the cost of calls that deters spammers, there are probably other regulations in play.
In Europe it's the mix of all laws. Mainly two made it dangerous to have a robot calling:
- you can get fined 220k per unsolicited call and
- fined same ranged amount for data leaks or selling without written consent (which often is a part of contracts but can be striked through by you. The other party have to decide then hehe)
Also, there are regulations that call centers must use real numbers and what's more important: they aren't allowed to hide them.
The mobile/landline Providers can be fined too if they do not cooperative with the local enforcement office and one does not want to have an argument with the office.
I get 1 spam call in 10 years. The last one I got, even "helped" helped me filling out the forms for my country's enforcement office.
I said like 4 times I'm not interested in getting sold something -> DIE IN PRISON!!!!
I get about one spam call per year in Denmark, and my work number is listed on the company website. However, I doubt it's only the cost of calls that deters spammers, there are probably other regulations in play.