Living in Germany, I get rarely get any. Usually about 1-2 per year. Last year was an exception, where the same entity (computer or very confused person) called me like 5 times before I blocked the number.
I gave out my number a lot in groups, but avoid giving it to online or delivery services.
Living in Germany, I never got any - until I had to register with my phone number at an American company (for work). Now I get 3-4 spam calls/messages per week.
I went to the USA for three weeks 8 years ago. I had a US prepaid phone with a number never published anywhere except my close family. I got three SPAM calls within these three weeks. Being back in Germany with my 20+ years old number I have received one call since.
I couldn't find any statistics about the frequency of spam calls in Germany, so I can only share my personal experience. I have never received a single one since having my own number. My parents got more when their number could still be found in the public phone book (yes, that is/was a thing). Friends complain maybe twice a year.
I am not a relevant example though, I am very cautious about giving out my number, usually I only do so when absolutely necessary and I often don't use services (like dating apps) if they don't let me without verifying my phone number.
(France) I'd say I get an average of 5 a week since the end of last year. Before that they were very uncommon.
I'd love to know what shitty company is selling my number to these guys because I pay a fee to my operator to have it unlisted, so it is not publicly available...
Tbh we are the OG anti vaxxers because of that one paper about the link between aluminum adjuvants in vaccines and autism IIRC. But that trend died down in the late 90's and we imported the new and improved brand of anti vax movements from the US with the COVID...
There are some scam calls to be fair, but it's really rare. Also you hear about these spoofing WhatsApps and stuff where they pretend to be your relative.
I know OP didn't ask, but as someone in the US I get at least four calls per day on weekdays. Sometimes ten. Weekends are a little better. But I do have two numbers, the second number is also forwarded to my cell phone. So it's probably marginally higher because of that.
But I do agressively forbid sharing my contact info through governmental blocks on sharing them/forbiding the sharing when I start using new services. Also I'm not in business as employer or as a freelancer.
Haha i moved from Canada to Germany. In Canada i would get at least 3 a week, in Germany I don't think i've gotten one yet in the two years i've been here
Look for something like "caller ID and spam" in the settings of your phone dialer app. I'm not sure if it's only available in newer Android versions, or only for Pixel phones.
UK here - 1 or 2 a week on my home phone which we never use and not many people have the number anyway. I have BT's 'Call Protect' which is supposed to let you block nuisance calls but it's such a pain to use - takes too many clicks and menu changes. On Android I just select last number and block.
Hardly any spam calls on mobile as built in software (forget the name) on my S23 automatically warns me of possible spam or blocks them completely.
Much better than it was 10 years ago - that was a nightmare.
I never got any for many years, but getting 5 to 10 every day since January when I switched gas company and as always denied every use of my number for marketing purposes.
I live in Italy.
Netherlands, I'm getting them off and on. I get scam SMS, WhatsAppor phone calls. Maybe 20-30 a year, but they aren't spread evenly. There are times I seem to be getting them all the time
It sucks because I know where they get my number. My elderly dad gets hacked and scammed constantly on Facebook. So if he has my number in his contact, I have to suffer as well. There should be some technical protection against that
Netherlands. They're rare but I do get the ones where they immediately hang up as it starts ringing and then hope you call back so they can charhe you money for it. But number recognition helps because generally I don't expect to be called from Nigeria or something.
The US has a national Do Not Call registry... you sign up online. It takes ~2 minutes to register and 30 days to take effect IIRC. Registering took my spam calls from several times a day down to several per year. The only ones I get now are political and people looking for the previous owner.
Edit: if you want to be proactive or vindictive you can report unwanted callers (or anyone using a robodialer) to the FTC.
Swiss: Basically none except for one specific type. Since the mandatory basic insurance is provided by „competing“ private insurers there are companies who call you at the end of the year and try to convince you to swap to a cheaper insurer. Otherwise, maybe 2 in the last 30 years.