671
Area code
GU
United States geographic area code, in service since 1997-07-01.
Statusin service
Introduced1997-07-01
JurisdictionGU, US
Local dialing10D
Last verified2026-09-17
Utilization 16.2% of assignable prefixes assigned
As of 09/17/2026
0%128 of ~792 assignable NXX values (200–999 excl. N11)100%
Prefix-level assignment does not equal number-level exhaustion; thousands-block pooling extends capacity. First assignment on record 2001-05-08, most recent 2025-12-16.
Area codes serve rate-center geographies, not municipal boundaries. “GU” identifies the jurisdiction, not an exact city footprint.
Top assignees
Ranked by assigned prefixes · initial assignee ≠ current carrier| Rank | Assignee | Prefixes | Share |
|---|---|---|---|
| 01 | TELEGUAM HOLDINGS, LLC | 53 | 41.4% |
| 02 | 24 | 18.8% | |
| 03 | PTI PACIFICA INC. | 19 | 14.8% |
| 04 | GUAM WIRELESS TELEPHONE COMPANY, LLC | 14 | 10.9% |
| 05 | MULTIPLE OCN LISTING | 9 | 7% |
| 06 | PTI PACIFICA INC. DBA IT&E - GU | 2 | 1.6% |
| 07 | PACIFIC DATA SYSTEMS - GU | 2 | 1.6% |
| 08 | DOCOMO PACIFIC, INC. | 2 | 1.6% |
| 09 | CHOICE PHONE, LLC DBA ICONN | 2 | 1.6% |
| 10 | PTI PACIFICA INC. DBA IT&E | 1 | 0.8% |
Important: these are initial assignees from NANPA CO-code records — the carrier a prefix was originally assigned to. Because of number portability, the current serving carrier of any individual number may differ.
Change history
Recorded events for this NPA- 1997-07-01Area code 671 entered service.
Planning letters & orders
Primary documents| Date | Document | Subject |
|---|---|---|
| 2021-01-08 | PL-556 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Lifeline) – supersedes PL-544 |
| 2020-08-17 | PL-544 ↗ | Transition to 10-digit dialing (for 988 as 3-digit access to National Suicide Prevention Hotline |
| 1996-08-05 | PL-004 ↗ | NANP- Introduction of New 671 (Guam) Numbering Plan Area (NPA) |