Question by Stuart: How do telemarketers know who is on the do-not-call list and who isn’t? I was thinking of starting a part-time home based business that requires cold calling of potential customers. How do I know if they are on the do not call list? Best answer: Answer by princess_tylenei suppose you won’t be… Continue reading How do telemarketers know who is on the do-not-call list and who isn’t?