The 671 area code covers Hagåtña in Guam.
Area code 671 is in Guam, on Chamorro Time. It has been in service since July 1, 1997.
- Where
- Hagåtña, Guam
- Time zone
- Chamorro Time
- In service since
- July 1, 1997
- Shares its area with
- No other area code
- Prefixes in use
- 95
- How to dial
- Local calls need all 10 digits: 671-555-0142.
Find out who called you from a 671 number.
Enter the full 10-digit number to see who it is listed to and the city and state on the listing. It is the same free check as our who called me lookup. To see only the caller ID name on the number, use our free CNAM lookup. To see whether it is a mobile, a landline or a VoIP line, use our free VoIP checker. To see which carrier a (671) number is on today, use our free carrier lookup.
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Hagåtña holds every phone prefix in area code 671.
A prefix is the three digits after the area code, and NANPA assigns each one to a town. Counting the 95 prefixes in use shows where 671 numbers are actually given out.
- Hagåtña95 prefixes, 100%
Teleguam Holdings holds 56% of the phone number prefixes in area code 671, more than all other carriers combined.
NANPA, which runs the North American numbering plan, assigns each prefix (the three digits after the area code) to one carrier. Here is how the 95 prefixes in use in 671 divide between carriers; holders this page does not name are grouped as other carriers.
| Carrier | Prefixes | Share |
|---|---|---|
| Teleguam Holdings | 53 | 56% |
| PTI Pacifica | 19 | 20% |
| Guam Wireless Telephone | 14 | 15% |
| IT&E | 3 | 3% |
| Docomo Pacific | 2 | 2% |
| Iconn | 2 | 2% |
| Pacific Data Systems | 2 | 2% |
Any number can also have been moved to another carrier since, so this shows who holds the prefixes, not who serves a given number.
Want the carrier of one exact number? Our free carrier lookup checks it, because numbers move between carriers.
Source: NANPA central office code assignments, October 1, 2026.
671 has covered the same ground since 1997.
1997
671 goes into service on July 1, 1997.
A 671 number on your screen can still be a scam, because caller ID is easy to fake.
- Let an unknown call go to voicemail. A real caller leaves a message; a robocaller usually does not.
- Look the number up with the box above before you call back, because calling back tells a robocaller your line is live.
- Hang up on anyone who wants gift cards, crypto or a wire transfer, or asks you to read out a code that was just texted to you.
- Report unwanted robocalls at reportfraud.ftc.gov, or paste a suspicious message into our free scam checker.
The area codes closest to 671 are 670.
This list measures the distance between the centres of each area, across state lines, and shows codes that share one area together.
These are the questions people ask most about area code 671.
Where is area code 671?
671 covers Hagåtña in Guam.
Which phone company owns area code 671?
No single phone company owns 671. NANPA's records show Teleguam Holdings holds the most 671 prefixes, 53 of 95, followed by PTI Pacifica and Guam Wireless Telephone. Numbers move between carriers, so check one exact number with a carrier lookup.
What time zone is area code 671 in?
671 is on Chamorro Time.
When did area code 671 start?
671 went into service on July 1, 1997.
How do I dial a 671 number?
Local calls need all 10 digits: 671-555-0142.
Is 671 a toll-free number?
No. 671 is a regular area code for Hagåtña in Guam, not a toll-free one. The toll-free codes in North America are 800, 833, 844, 855, 866, 877 and 888.
What area codes are near 671?
The closest are 670 (Saipan, the Northern Mariana Islands), measured between the centres of each area.
Who called me from a 671 number?
Enter the full 10-digit number in the lookup above. It returns the listed owner where there is a public record, where the number is registered, and whether it is a mobile, a landline or a VoIP line.
Is area code 671 a scam?
671 is a real Guam area code, so the code itself is not a warning sign. Scam callers fake local-looking numbers on purpose, so judge the call by what the caller asks for, and look the number up before calling back.
Put this lookup on your site: our free area code widget takes two lines of code and shows any US area code's state, time zone and local time.
Source: NANPA, the North American Numbering Plan Administrator: its area code database and prefix assignments, as of October 1, 2026.