When I was in Japan, I had an account with DOCOMO (local cellphone service). I used the number frequently delivery services, bank services, hotels, etc. I never

When I was in Japan, I had an account with DOCOMO (local cellphone service). I used the number frequently delivery services, bank services, hotels, etc. I never received a single unwanted phone call. I return to USA I get new cellphone service and same day I get dozens of unwanted calls and immediately have to block all numbers not in my contact list. Since the problem of unwanted calls doesn't exist in some countries, I have to assume that it is a solvable problem. Countries where it is a problem simply don't wish to solve it. I suspect it is simply some countries favoring corporations over individuals.