670 Area Code — the Northern Mariana Islands
Area code 670 serves the Northern Mariana Islands in the Chamorro time zone, in service since 1997. Consumers have filed 31 unwanted-call complaints against 31 different 670 numbers, 2 of them with the FTC in the last 30 days. Look up the exact number that called you below.
Area code 670 at a glance
- State
- the Northern Mariana Islands
- Local time
- —Chamorro
- In service since
- July 1, 1997
- Local dialing
- 7 digits allowed
Sources: NANPA area code and central office code records (refreshed weekly); cities and counties matched from US Census Bureau and USGS place names.
Reported 670 numbers
No single 670 number has enough complaints yet for a full report page, so none are listed. Look up the exact number that called you: the lookup works on every US number, whether or not it has complaint history.
Is it getting worse?
FCC complaints about 670 numbers peaked in 2016 (11); the FTC's daily Do Not Call data has carried most of the volume since mid-2026.
FCC complaints per year
Years shown as '15 to '26; the current year is partial.
Carriers operating in 670
NANPA has assigned 35 670 prefixes (NPA-NXX central-office codes) across 3 rate centers: 14% to wireless carriers, 43% to landline and VoIP operators. The newest assignment was 2018-04-20. The carrier holding a prefix is who the number was issued through. It says nothing about who is calling, since caller ID is routinely spoofed.
| Carrier | Type | Prefixes | Rate centers | Newest assignment |
|---|---|---|---|---|
| Micronesian Telecommunications Corporation | Competitive / VoIP (CLEC) | 15(43%) | 3 | 2005-06-01 |
| Pti Pacifica INC. | Unclassified | 15(43%) | 1 | 2018-04-20 |
| Guam Wireless Telephone Company, LLC | Wireless | 5(14%) | 3 | 2005-04-05 |
Largest rate centers (exchanges) by prefixes: Saipan (31), Rota (2), Tinian (2). Source: NANPA Central Office Code Utilized Assignments (public, refreshed weekly).
What to do about calls from 670 numbers
Before you call back
- Impostor (government, business, family) is the top named complaint here. Hang up and call the agency, bank or relative back on a number you already know. Government agencies don't demand payment by gift card, wire transfer or crypto. Read about Social Security impostor calls and fake bank fraud calls.
- Look up the full number above. A missed call from 670 with no voicemail is usually a robocall; anyone who needs you will leave a message.
- Block repeat callers: iPhone, Android, or your carrier's free filter (Verizon, AT&T, T-Mobile).
Report it in the Northern Mariana Islands
- Unwanted sales calls and robocalls: donotcall.gov (FTC). Scams and fraud: ReportFraud.ftc.gov.
- Spoofing, texts and call-blocking problems: FCC consumer complaints.
Your FTC and FCC reports are published (without your name or number) in the datasets this page is built from. How to report unwanted calls.
Area code 670: questions answered from the data
Where is area code 670?
Area code 670 serves the Northern Mariana Islands. It has been in service since July 1, 1997.
What time zone is area code 670 in?
Area code 670 is in the Chamorro time zone (UTC+10 all year). The current local time is shown at the top of this page.
How do I report a 670 scam call in the Northern Mariana Islands?
Report unwanted sales calls and robocalls to the FTC at donotcall.gov, and scams to ReportFraud.ftc.gov. The FCC takes complaints at consumercomplaints.fcc.gov. Reports feed the public data this page is built from.
Sources: FTC Do Not Call complaints (unverified consumer reports), published every weekday and available here from Jul 24; FCC Consumer Complaint Data, public record, imported nightly; NANPA numbering records. A number appearing here means consumers reported calls that displayed it. Caller ID can be spoofed.