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How to Stop Unwanted Phone Calls: 9 Steps (with Pictures)

To stop unwanted phone calls, download a call-blocking app on your cell phone, which will prevent unknown numbers from contacting you. If you're using a landline, you can set up an inbound call blocker so that callers have to punch in a code to reach you. Since telemarketers won't have your code, they won't be able to call you.