The phone company does not give your number to the world unless your phone number is published in the company's phone book. Scam caller get your number by simply sequentially dialing every number in an area code. If the call is answered, it is recognized as a live number and can be sold to other scammers. Blocking robocall phone numbers is pointless. A robocaller can use a different caller id on every call by "spoofing" their phone number. The only remedy is to not answer any call that is from an unknown number. If it is a legitimate call, the caller can leave a voice mail. Robocallers do not leave voice mail.
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