How to call to the Northern Mariana Islands (country code +1 670)

Note: Northern Mariana Island phone numbers (country code +1 670, or area code ‘670’ in the North American Numbering Plan) are often confused with East Timor (country code +670) phone numbers.

Calling to the Northern Mariana Islands

  • A leading ‘1’ is included in the international call sequence.
  • A leading '+' in the phone number means 'dial your country's exit code'.
  • Calling from a mobile phone: dial from on the country where you're currently located.
  • Calling from a VoIP or satellite phone: dial from on the country where the phone is registered.

… to a mobile (cellular) phone or text (sms)

Use the same call sequence.

When calling a mobile phone user, call to the country where the mobile phone is registered, regardless of where the person being called is currently roaming.

… to a VoIP phone

Use the same call sequence.

When calling a VoIP phone user, call to the country where the VoIP phone is registered, regardless of where the person being called is currently roaming.

… to a satellite phone

The Northern Mariana Islands do not have a country-specific satellite phone system.

Most satellite phones operate on their own country code – calls to these satellite phones follow their own call sequence.

… sending a fax

Use the same call sequence.

Calling within the Northern Mariana Islands (domestic dialing)

There is no trunk prefix (1) or area code (670) used when calling within the Northern Mariana Islands.

Only the seven digit phone number is dialed.

seven digits
local phone number

Northern Marianan phone numbers explained

Number details

The Northern Mariana Islands’ phone numbers are ten digits (eleven including a leading ‘1’ that acts as a country code for the entire NANP calling region).

The first three digits are ‘670’ – an area (geographic) code to designate the Northern Mariana Islands’ phone system within the North American Numbering Plan.
The first three digits of the local phone number are an exchange within the Northern Mariana Islands’ code of ‘670’.

Mobile numbers are intermixed with land-line phone numbers.

An example of a Northern Marianan number

The Hyatt Regency Saipan lists its phone number in Saipan as +1 (670) 234-1234.

Number explanation
1670234 1234
country code for the Northern Mariana Islandsarea code for the Northern Mairana Islands within the NANPlocal phone number within Saipan
Local example – calling from another location in Saipan, Northern Mariana Islands

Dial the seven digit phone number when calling anywhere within the the Northern Mariana Islands. Do not include the trunk prefix / country code ‘1’ or the area code ‘670’ in domestic calls.

234 1234
local phone number within Saipan
Long distance example – calling from San Jose Village, Northern Mariana Islands (on the other side of the country)

Dial the seven digit phone number when calling anywhere within the the Northern Mariana Islands. Do not include the trunk prefix / country code ‘1’ or the area code ‘670’ in domestic calls.

234 1234
local phone number within Saipan
International example – calling from the United States, Canada, or another country of the NANP (most of the Caribbean and U.S. territories in the Pacific)

To call within the NANP dial the phone call with the same call sequence as a U.S. or Canadian long distance call.

Dial the combined country code / trunk prefix of ‘1’, then the Northern Mariana Islands’ area code within the NANP of ‘670’, then the local seven digit phone number.

1670234 1234
long distance trunk prefixarea (geographic) code for the Northern Mariana Islandslocal phone number in Saipan
International example – calling from a country outside of the NANP (the United States, Canada, most of the Caribbean, and U.S. Territories in the Pacific)

To call from a country from outside the NANP, dial the exit code of the country you’re calling from, then the NANP country code / trunk prefix of ‘1’, then the Northern Mariana Islands’ area code of ‘670’, then the local phone number.

exit code1670234 1234
exit code of the country the call is dialed fromcountry code for the North American Numbering Planarea (geographic) code for the Northern Mariana Islandslocal phone number in Saipan

Calling from the Northern Mariana Islands

… to another country in the North American Numbering Plan (NANP)

NANP countries include Canada, the United States (and associated territories), and most regions of the Caribbean.

Dial the phone call starting with the trunk prefix / country code of ‘1’, then the area code and local phone number.

… to all other regions of the world

‘011’ is used as an exit code when dialing an international phone call from the Northern Mariana Islands to a location outside the NANP calling region (the United States, Canada, most regions of the Caribbean, and U.S. Territories in the Pacific).

Administrative and regulatory

  • National NANPA – the North American Numbering Plan Administration. Telecommunications numbering system regulator for numbering administration across the North American Numbering Plan.
  • ITU (International Telecommunications Union) – United Nations specialized agency for information and communications technologies

Sources and more resources