Area code 000 is not a valid number in any country where dialling '0' reaches an operator.

Area code 000 is not a valid North American Numbering Plan exchange or area code.

It is invalid in the European Union and many other nations where '0' is reserved as a trunk prefix and '00' as an international call prefix.

In Australia, 000 is reserved as an emergency telephone number.

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, because there is no requirement that caller id data represent a valid telephone number.^{[1][2][unreliable source?]}

• Caller ID spoofing
• 000, Australian emergency telephone number