Area code 671: where it is and who calls from it
Area code 671 is in Guam.
Guam (includes Andersen Air Force Base)
| Where | Guam |
|---|---|
| Time zone | Chamorro (Guam) Time ยท local time |
| In service since | 1997 |
| Overlay | No |
| Prefixes assigned | 95 of 792 possible (12%) |
Where 671 numbers started
Every prefix is assigned to a rate center, the local calling area it was set up in. These are the biggest in 671, with how many prefixes each has.
Who holds 671 numbers
- Mobile carrier 15%
- Phone company 85%
| Carrier | Type | Prefixes | Share |
|---|---|---|---|
| Teleguam Holdings | Phone company | 53 | 56% |
| Pti Pacifica | Phone company | 19 | 20% |
| Guam Wireless Telephone | Mobile carrier | 14 | 15% |
| IT&E | Phone company | 3 | 3% |
| Pacific Data Systems | Phone company | 2 | 2% |
| Iconn | Phone company | 2 | 2% |
| Docomo Pacific | Phone company | 2 | 2% |
Most prefixes are pooled: the 10,000 numbers in each are handed out in blocks of 1,000 to different carriers, and people can also take their numbers to another carrier. So the carrier shown is where the prefix started, not a guarantee about any one number.
States served: Guam.
Got a call from 671?
An area code tells you where a number was first assigned, not where the caller is. People keep their numbers when they move, and scammers can fake any number. If you weren't expecting the call, let it go to voicemail.
If the call shows a 671 number that matches the first six digits of your own, that's often neighbor spoofing. Use the box above to check the full number.
Area code facts from the NANPA area code database (updated 10/06/2026); prefixes and carriers from NANPA's central office code records (updated 2026-10-10). Place description adapted from Wikipedia, CC BY-SA 4.0.