You and everyone gets unwanted calls due to a process that came about during the "FAX" craze days. Fax machines were programed to dial numbers in order 746-0001,746-0002 and so on until all 10,000 numbers in each office code was dialed,
then sales people started doing the same thing The real problem with privacy not just on a telephone but across the board.
Welcome to the twenty first century, any and all personal information can be gotten in a few minutes by anyone with a computer. Another example is the reverse phone book that has every name, address, and number but has to be bought.
What a web we weave!
MIKLO