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while not a valid United States area code, is actually an "outbound-only" area code. This code may show up as part of a number on a caller id system when receiving telemarketer outbound calls or from VoIP services, such as Skype or Vonage.

In the original Bell DDD system no valid exchange could have a 0 or 1 in the middle digit, as these were area codes. However this was changed to provide more area codes, when they began running short. However no exchange or area code can begin with a 0 as this dials the operator. But this code might be generated internally by switching equipment in special cases.

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Q: Is telephone exchange 000 valid
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