So I have an unlisted IDSN 3 line residence phone number.
However since the summer 2015 I am receiving 3-4 phone calls per day. These are automated and automatic machine calls. And once I answered, I started getting many calls from Inusrance brokers, insurance companies, telemarkter for magazines, etc. They then find what time your home and share this with their partners or sell lists, so they can harass you, over and over. And strange I am have received 13 telemarketing calls also on my mobile. So I assume/guess is that I endered some contest, Expo exibitor registration, or other. They then have shared my information to these types of companies, and I totally regret. As I use my home and mobile for both personal & BUSINESS.
Normally phone lines are either Analog, IDSN, or IP digital. IP Digital you can block up to about 50numbers, the others, very difficult. Now im no expert, so talk to your land line or mobile providers, but on my mobile I can block numbers very easily.
I was really not aware of these types of calls and also assumed that in Switzerland that if companies call over n over (considered harrasement), its an offence and can be reported. It is an offence, but the procedure is very complicated. Also if you every get any calls that you can identify and they are in anyway threatening, then report to the police.
I have now amased a list of phone numbers that are telemarketing:
032 580 0413
041 588 0496
041 588 0783
043 508 6266
043 508 6403
052 508 7263
058 100 0860
058 100 0871
058 577 1277
061 388 3961
062 588 0308
062 588 0360
071 588 0380
As you see, there is a sort of a patern, you will soon recognize them, never every answer or accept, or you will get call after call.
I done a bit research and here are a few helful sites, but if in question, contact your phone carrier.
DONT BE A VICTIM/HARRASSED by THESE SCAMERS (scum) AND POOR BUSINESS PRACTICES.
https://www.swisscom.ch/en/residential/help/loesung/blocking-calls.html
http://faq.sunrise.ch/en/faq/3475.html



