When a telephone survey is conducted, some dialings will result in a message stating that the number they have dialed has been changed. The message often includes the new number. "Number changed" dispositions in RDD samples are normally classified as ineligible, but there are some circumstances for which the researcher might want to considered such numbers eligible and call the new number.

When a household changes its landline phone number, it is usually because that household has moved to a new location. If the move was to a location outside the exchange boundaries of the old telephone number, a U.S. household traditionally had to obtain a new telephone number in an exchange serving their new address. However, number portability has changed this by allowing people to ...

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