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If an area code is unassigned, no one can call it. In order for you to call a telephone number, your phone company's switching equipment must recognize it as a valid number.

If an unassigned area code shows up on your Caller ID, there are several possibilities:

  • An international number got displayed as if it were a domestic number. For example, a number in Munich, Germany (+49 89 ...), might show up as 498-9xx-etc.
  • A glitch in the system caused the Caller ID data to be mangled.
  • A telemarketer or scammer "accidentally misprogrammed" (oops!) their telephone equipment to send bogus Caller ID data. Unfortunately, this is quite easy to do if you have a PBX (business phone system).
  • Google Voice accidentally assigned some numbers in non-existent area code 333.
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13y ago

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