Good start. Next, put the people running these scam phone providers in jail.
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There are applications to block international calls but that only helps if the number is not spoofed. People that have SS7 lines into the telco system can spoof as just about any number. I wanted to kill those circuits but my employer at the time said, "they are paying their bills, arent they?". This was in the 90's. I guess the laws are every so slowly starting to catch up.