How to Block Phone Autodialers

Written by thomas mcnish
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How to Block Phone Autodialers
Block autodialers from calling your home phone. (John Foxx/Stockbyte/Getty Images)

Phone autodialers are machines used by telemarketers to automatically call phone numbers on a company's list. Whether you've subscribed to something or not, you may still end up on a company's autodialer list. There are several way to prevent unwanted calls from these telemarketers, some more drastic than others. Consider all the options before choosing what works best for your personal situation.

Skill level:


  1. 1

    Sign up for the National Do Not Call Registry (see Resources). Telemarketers are not allowed to call you if your phone number is on the national "do not call" list. Allow up to 31 days after signing up for the calls to stop.

  2. 2

    Call your phone company and ask about a service called anonymous call rejection. Subscribers activate it by dialling *77 from their phone. All calls that appear on the Caller ID as "Unknown," "Restricted" or "Private" will be blocked automatically. Many autodialers have generic, restricted or unknown numbers and are blocked by this service. There may be an additional monthly fee for anonymous call rejection.

  3. 3

    Purchase an inbound call blocker. This is a machine that connects to your phone's Caller ID and blocks all incoming callers who don't have a special code. This machine is a one-time purchase, unlike fees that must be paid monthly to your phone company for other services. However, it requires that you give out the code to desired callers. Someone trying to contact you who does not have the code will be unable to reach you by phone.

  4. 4

    Speak with your phone company about a service called call blocking. After receiving a number from an autodialer, dial *60 and listen for the automated voice prompts to block that number. From this point forward, when that autodialer calls your number, it will be blocked. This may cost an additional monthly fee, depending on your phone company's policies.

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