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1) Do-not-call list. However, most of the teleslime either figure some way to claim a prior business arrangement, claim to be a survey firm or nonprofit, or simply ignore the list, so this is of limited usefulness. If you can prove they ignored the list you can get them fined, though.
2) Caller ID. Yeah, it rankles to pay the Phone Company for this, but there is significant advantage to seeing "OUT OF AREA" or "CREEPY MORTGAGE COMPANY" and being able to ignore the call.
3) Telezapper. I haven't used one myself, but I'm told they work. When you pick up the phone, it plays one of the DTMF control tones indicating a disconnected number. This tricks the predictive dialing equipment into marking your number for removal.
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